I. Fill in the blank with an appropriate preposition 1. Many other species exist________________ this planet. 2. Human beings have a great influence________________ the rest________________ the world. 3. They are affecting the water supply by using water________________ industry and agriculture. 4. They are changing weather conditions by cutting________________ trees in the forests. 5. This has resulted________________ two serious consequences. 6. As a result, the number________________ rare animals is decreasing so rapidly that they are________________ danger________________ becoming extinct. 7. Scientists have made lists________________ endangered species and suggested ways to save them. 8. Many organisations have been set________________ and funds have been raised. 9. Thousands of national parks all________________ the world have been established to protect endangered animals. 10. If people’s interference________________ the environment decreases, more species will survive and produce offspring. 11. The amount of solar energy that reaches the earth depends____________________ the atmosphere. 12. The natural environment consists____________________ all natural resources. 13. Solar energy can be changed____________________ electricity. 14. Human beings have a great influence____________________ the rest of the world. 15. What exactly is the influence of air pollution____________________ human beings? 16. The campaign will hopefully ensure the survival____________________ the tiger. 17. The EU has imposed a ban____________________ the import of seal skins. 18. Human beings are responsible____________________ the changes in the environment. 19. If people’s interference____________________ the environment decreases, more species will survive and produce off- spring. 20. National parks should be set____________________ to save animals and plants. 21. ______ present, most of our energy comes______ fossil fuels. 22. Solar energy can be changed______ electricity. 23. When water moves ______ a high place to a lower place, it makes energy. 24. Water energy is used______ create electricity. Its power gives energy______ pollution. 25. Nuclear energy can provide enough electricity______ the world’s needs for hundreds of years. 26. Many organizations have been set ______ to study alternative sources of energy. 27. How______ make use______ alternative sources of energy is a question for researchers all______ the world. II. Write the correct tenses. 1. Look! The train________(come). It always__________(come) to the station on time. 2. I need an umbrella because it (rain). 3. The burglar__________(open) the safe when he___________(hear) footsteps. He immediately________(put) out his torch and_____________ (crawl) under the bed. 4. Just as I_________(wonder) what to do next ,the phone rang. 5. Why _____________you_____________ ( buy ) this paint last week ? 6. Until yesterday, I_______ (never, hear) about it. 7. Sam___________ (leave) before we________ (get) there. 8. He_____________ (watch) television when the phone rang. 9. After the guests_________ (leave), I_________ (go) to bed. 10. When Judy (get) home, her hair _______still (be) wet . 11. Water (consist) __________________ of hydrogen and oxygen. 12. John (sleep) __________________ right now 13. Alice and Louise (not, buy) __________________ anything at the store yesterday. 14. After they (leave) __________________, we (sit) __________________ down and rested. 15. John and Mary (talk) __________________ on the phone now. 16. After three days of rain, I’m glad that the sun (shine) __________________ again today. 17. He (write) __________________ his report for two days, but he (not, finish) __________________ it yet. 18. I (stand) __________________ under a tree when it (begin) __________________ to rain. 19. He (need) __________________ a pen at the moment. 20. Last year at this time, I (attend) __________________ school.

Hoà tan hoàn toàn 50g CaCO3 vào dung dịch HCl dư. Biết hiệu suất của phản ứng là 85%, thể tích của khí CO2 (đktc) thu được là: A. 9,52l B. 7,14l C. 9,25l D. 11,2l

Làm giúp mình nha <3 Câu 4: Thực hiện phép tính (tính nhanh nếu có thể) (-99)+(-98)+(-97)+...+97+98+99+100

So sánh thái độ chống thực dân Pháp của nhà Nguyễn và nhân dân sáu tỉnh Nam Kì trong thời gian 1858 – 1873?

1. Choose A , B , C, or D to complete the sentence. If I _____free tomorrow, I’ ll go to the mountain. A. am B. will be C. were D.can 2. Choose A , B , C, or D to complete the sentence. It ________ quicker if you use a computer. A.is B.will be C. was D. would be 3. Choose A , B , C, or D to complete the sentence. If he _____ hard today, can he have a holiday tomorrow ? A.work B. worked C. works D.will work 4. Choose A , B , C, or D to complete the sentence. Hurry up! If we don’t hurry, we _________ late for school. A. won’t be B. would be C. will be D.must be 5. Choose A , B , C, or D to complete the sentence. What will you do if she ________ your invitation ? A.refuse B. will refuse C.refused D. refuses 6. Choose A , B , C, or D to complete the sentence. If you take my advice, everything ________ well. A. can go B.could go C. go D. went 7. Choose A , B , C, or D to complete the sentence. ____more vocabulary if you want to be good at English. A.Learn B. To learn C. Learning D.Learnt 8. Choose A , B , C, or D to complete the sentence. If my watch ________, I have to buy a new one because I need one. A.broken B. is broken C.broke D.breaks 9. Choose A , B , C, or D to complete the sentence. If you park your car in the wrong place, you ________ pay a fine. A.would B.should C. have to D.could 10. Choose A , B , C, or D to complete the sentence. If you are busy, we ________ this by ourselves. A. will do B.do C. should do D.could do 11. ________ you work harder, you’ll fail your final exam. A.Unless B. If C.If only D. Although 12. If we _____ the water, we _______no fresh water to use. A.pollute / will have B.pollute / won’t have C. polluted / wouldn’t have D.don’t pollute / will have 13. If it ___________ heavily this evening, we won’t go out for a walk. A. doesn’t rain B.rains C. rained D. didn’t rain 14. If you go away, please_____ to me. A. write B. writing C. wrote D.will write 15. These plants will die if you _______them regularly A.won’t water B.don’t water C.will water D.water 16. If he _____ faster ,he’ll be the winner. A. didn’t run B. doesn’t run C. runs D.ran 17. _____ I finish my homework, I can’t watch the cartoon on TV A.If only B.Although C.Unless D. If 18. I will play tennis tomorrow if the weather _____ nice. A. is B.was C. has been D.were 19. I’m going out now.If anybody ______while I _____ out,can you take a message ? A.phone/ am B phones/ am C phone / will be D. phones / will be 20. If you cross the red light, you________ A. will fine B.would fine C.would be fined D.will be fined 21. “ Unless someone has a key, we can’t get into the house” means: If someone has a key, we ___________________ A. can’t get into the house B. can get into the house C. couldn’t get into the house . D. could get into the house 22. “ Unless he phones immediately, he won’t get any information” means: He won’t get any information if ______________________ A. he phones immediately B. he didn’t phone immediately C. he doesn’t phone immediately D .he phoned immediately 23. If the kitchen is in a mess, you ______clean it A.will B. may C.must D.might

đố mọi người đây là hai nước nào

Trình bày đặc điểm phát triển của một số nước Đông Á?

Tìm hai phân số có cùng mẫu số, có mẫu số là một số có 1 chữ số và các phân số đều lớn hơn1/3 và bé hơn 2/3.

a. Phân loại các từ ghép sau thành nhóm từ ghép chính phụ và từ ghép đẳng lập: tươi vui, đau lòng, xanh ngắt, xem xét, sai lầm, hạnh phúc, tiếng nói, xanh lè, xoài tượng, chim sâu, học hành, đường phố, mát lạnh b. Nhận xét nghĩa của 2 nhóm từ ghép trên, mỗi nhóm phân tích một ví dụ cụ thể.

giúp mik hết với ạ mik ngu địa lắm mik sẽ vote+cảm ơn