cho số tự nhiên a chia cho 7 dư 3 . Chứng minh a^2 chia 7 dư 2

I/ Chọn câu trả lời đúng 1.Drivers should slow ... on this road because it is slippery after rains. A. On B. Down C. Up D to 2. Pollution has bad effect ... out life A of B to C with D on 3. Before you light ... a cigarette, remember to ask for permission A. Up B. Down C on D off 4. It’s very kind ... you to offer us a lovely dinner. A of B from C for D to 5.The woman was pale and week because...the lack...fresh air. A.for/on B.on/for C.of/of D.of/for 6.I’m not good...English. I think i should spend more time...it. A.in/at B.at/on C.at/in D.on/at 7.An umbrella is what i need now, it’s raining. I’ll give it...tomorrow A.up B.away C.back D.over 8.I couldn’t find any place to go...holiday. A.at B.for C.up D.on 9.I’m fed...doing the same work every day. A.out of B.forward to C.on to D.up with 10.have you ever thought...giving up smoking? A.over B.of C.on D.at 11.if you don’t know the meaninh of the word, you should look it... in the dictionnary A.out B.in C.up D.on 12.she has tried...severnal shoes but she can’t find suitable ones A.at B.in C.out D.on 13.The party begin at 7 o’clock and I’ll pick you...at 6:30 A.on B.in C.away D.of 14. I come...an ancient city, sometimes referreo...as the Athens of the A.on/as B up /to C over/ to D from/to 15. The house is... fire. Please call...help! A at/to B for/at C on/for D from/to 16. An apple stand...the New York State A for B on C up D at 17 She keeps... complaning....the weather A in/of B on/about C out/about D on/in 18 some pesssimistic persons think that the world rescources will run...in some day A off B of C out D on 19 let’s get acquainted...the new comet A to B of C with D about II/ 1. We don’t have time to think it .... A. On B. Up C. Out D. Over 2. I object ... being kept waiting. Why can’t you be ... time ? A at/ in B for/in C to/on D at /on 3. You aren’t aware ... the time, are you ? You are always late ... work A of- for B for - of C on/ at D on / for 4. If someone knocks .... the door .... night, don’t open it. A on / at B at / at C up/ in D at /on 5. Everything is available.... the operation A of B on C from D for 6. He is very keen .... English, but he is not good ... listening A at/on B on/ at C at/ at D to/of 7. Your hairstyle is quite similar ... me A. From B with C of D to 8. Nguyen Du devoted all his lifetime ... writing A. For B. To C. In D. From 9. I bought a coat ... my brother ... the supermarket A. From/for B for/at C for / from D for / in 10. She was very surprised... the grade she received A. At B. On C. Of B about 11. We might need more food, depending.... how many people turn up. A for B on C at D with 12 Jane doesn’t spend much money ... clothes A over B about C at D on 13. A sign warned motorists .... dangers A of B for C about D. A and C 14.They translated the letter.... French A for B with C into D about 15 Since she graduate, Anne has no longer been dependent ... her parents for financial support A to B on C upon D. B and C 16 Catherine became accustomed..... spicy foods when she was travelling A to B on C for D about 17. Table salt is composed .... two elements, sodium and chlorine A to B around C of D for 18. Washington state is famous .... its apples A in B for C of D with 19. People who are afraid .... height are called acrophobias A of B on C in D to 20 Water is essential.... all life A. On B. For C in D with

Giúp mình với các bạn , giúp được bài nào cũng được

Vẽ kí hiệu của Đóm J97 Vẽ chữ Đóm FAMILY

vẽ hạt đậu mầm 3 thú 2 ảnh học và 1 ảnh tự do

Làm bài này giúp mk vs. Ko cần vẽ hình đâu

a)|x+2|=0 b)|x-5|=|7| c)|x-3|=7-(-2) d)(7-x)-(25+7)=-25

Liệt kê các phần tử của tập hợp : C = { x ∈ Z , lxl ≤ 10 }

So sánh hai số A = (2+1)(2^2+1)(2^4+1)(2^8+1)(2^16+1) và B = 2^32 +1

III. Cho dạng đúng của từ trong ngoặc: a. I (1-not like) ................ coffee very much. b. Mrs.Nga (2- be) .................. a doctor. She (3-work) ................ in a hospital. c. Lan (4-visit) ............... Hue this summer vacation. d. What you (5-do) ................ now? I (6-do) ............. my homework. e. There (7-be) ................ some milk in the fridge. f. Look ! The plane flying towards the airport. It (8-land) ............... g. My father (9-watch) ......... Tin the livingroom. He often (10-watch) ........ TV in the evening. IV. Sử dụng từ loại đúng của các từ cho sẵn để hoàn thành câu. 1. It's very .............. in the city. (noise) 2. There is a ......... next to my house. (bake) 3. She is a ............. of English. (teach) 4. I brush my .............. twice a day. (tooth) 5. Long goes ........... at the weekend. (sail) 6. Their house is on the ............. floor of the building. (five) 7. Thai Binh is .............. than Hanoi. (small) 8. Do you ............. play video games ? (usual) 9. This is the ........... house in my village. (old) 10. Peter ........... a very big truck. (driver)