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Một miếng đất hình chữ nhật có chu vi 70m . Nếu tăng chiều rộng và giảm chiều dài 4m thì diện tích giảm 12m^2. Tính diện tích ban đầu của miếng đất Giaỉ giúp mik nhé))):::::
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81...............you................... (do) the homework yet? 182. It is very exciting.............................(see) that film. 183. Lan .......................... (see) this film three times. 184. We..............................(wait) you since two o’clock. 185 . My brother is good at...........................(fix) things. 186. May I .............................(go) out now , Mom? 187.We (not go) ............................to the cinema last week. 188. Mrs. Loan (teach)...........................us Math two years ago. 189.Last Sunday, Daisy (iron)..............................all her clothes. 190. She (do)...........................her homework recently. 191. I want (come)........................with my mother. 192. The doctor advised me(not smoke).......................cigarettes. 193. The boys stopped (play)....................football because of the rain. 194. Students have (wear)....................uniform when they go to school. 195. Mai’s mother told Mai (correct).........................the mistakes in her dictation. 196. This bike ( use )............................................................for six months. 197. I ( watch)......................... T V when the phone (ring)........................................ 198. Would you like ( take) ......................................a photo? 199. It is interesting ( study)..............................English. 200. Tom used ( like) ...................riding the bike when he ( be).................... a child. He (not drink)...............(some) ....... wine last year. He often (go) ............ out at night although he (use)........to stay home and (watch)............ TV at night. He (tell) ............ about (he).......... last night to us. There (be) ...........a TV set at his house 3 years ago. He (be) ........going ( buy) ........ a new ........... next month. 201. Mrs. Ha (like) .................... playing volleyball when she (be) ............ young. She prefers (look).................children playing volleyball together. 202. She never (allow)...... her students (go) ...... out. She (use) ..... think that children (ought)................ get up early in the morning and (go) ... to bed early ........... the evening . 203. The disease (spread).................fast now. Marconi (invent)...............the radio. The students must (be)................back by 5.30 p.m Nam (like)............. basketball. I hope (visit).................you in Hanoi soon. Why (be)................. Lan absent from school yesterday? I’d like (buy).................a new dictionary. Nga (receive).....................a letter two days ago. Yesterday, Mai(go)........... to the supermarket. Nam would like (tell)...............you about his family. Vegetables often (have).................dirt from the farm on them. Be careful, the children (cross)................ the street. Mai (be)...............15 years old next year. I (not watch).....................TV last night, he(read)...............a newspaper. You should (add).........a little salt. I (be).........very tired when (catch)............. a bad cold two day ago. You should (go)............to bed early. I hope you (feel).................better soon. All of students (wait)...................for the principle in the school yard now. Hoa (need)...............a lot of sugar. Ba (not come) ...................to the meeting last week. Nga never (take)................ medicines. 204. Mai lived in Hanoi last month, but now she (live)..................... Danang. Last week, she (go)...................shopping with her mother. She (buy).........................a lot of things there. Yesterday, She (had) ...................a small party at her house. She (invite) ........................... some new friends in her new school and the neighborhood. This morning, she (go)......................to her new school. And she (feel) ...................... very happy. She (think).......................that she (go) ..................... to school by bus because there is a bus stop near her house. 205. He (go) .......... to school when he was 14 years old. He (see) ........... Tom in a small house and they(write) .......... many stories in 1997. They (live) .......... there 3 months and (move) ........... to Hue . They (build) ............. a new house(live) ........ . They (work) ................. with deaf-mute and (invent) ......... a device (name) ............. phone. Now they ( live) ............. in a big house with modern equipments. Tom (watch)............. TV news every night (know)............. the world. They(be)...........proud......... themselves .

Các bạn ơi giải giúp mình bài này với, mình phải nộp bài sớm nên các bạn làm đúng giúp mình nhé. Mình cảm ơn 1. All the aquatic animals will die if people _____ dumping sewage into the lake. A. will stop B. don't stop C. wouldn't stop D. stop 2. Canada ____________ up of 10 provinces and 3 territories. A. is making B. is made makes made 3. It’s only my first week in Wales, and I _____ so many interesting things already. A. see B. am seeing C. saw D. have seen 4. Aquatic life suffers or dies ______ thermal pollution. A. due to B. thanks to C. in spite of D. despite 5. I can’t hear your voice __________ I’m wearing an earplug. 1 điểm A. although B. due C. however D. because 6. His grandfather _____ him __________ hard when he was small. A. made - study B. makes - to study C. making - studying D. made - studied 7. This picture __________ the contamination of ground water. A. illustrate B. illustrating C. illustrates D. illustrated 8. Global warming ____ if there ____ too much carbon dioxide in the atmosphere. A. would happen – wasn’t B. will happen - were C. wouldn't happen - weren't D. won't happen - was 9. The temperature of water increases; ____, many fish in the river die. A. so B. otherwise C. therefore D. nevertheless 10. If we dump a plastic into the ground, it ________ a long time to disappear. A. will take B. take C. took D. takes 11. At present, the National Cherry Blossom Festival ____________ in Washington D.C. to celebrate spring’s arrival. A. occur B. occurs C. is occuring D. has occured 12. Recently, many places in New Zealand _____ called with two names – one English, one Maori A. are B. is C. has been D. have been 13. What would you do if a factory in your neighborhood ______untreated water into the river? A. dump B. dumped C. dumping D. dumps 14. Canada ___________ the longest land border in the world with the United States. A. shares B. has been sharing C. is sharing D. has shared 15. If I _____ the president, I ______ all the factories out of the city. A. was - will remove B. am - will remove C. am - would remove D. were - would remove 16. The train __________ the railway station at 8:00 a.m. every morning. A. leave B. leaving C. will leave D. leaves 17. In Canada you should maintain eye contact while you __________ hands. A. shake B. have shaked C. shaked D. are shaking 18. Ireland ___________ the Eurovision Song Contest seven times. A. won B. wins C. has won D. is winning 19. ____ factories produce waste and pour it into rivers, many rivers and lakes are poisoned. A. Because of B. Although C. Since D. While 20. Since 1965, the maple tree with red leaves _____ the most well-known Canadian symbol. A. has become B. become C. became D. is becoming

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