I. Choose the best answer. 1.The water in the lake ...............been polluted by a ship. A. have B. has C. to have D. having 2.Thousands of people ……………….by natural disasters every year. A. are affected B. are affecting C. are affecting D. were affected 3.Nick and Mi will give a talk ..............water and air pollution. A.on B. in C. at D. about 4.Students are more aware of ...................the environment. A. to protect B. protecting C. is protect D. protected 5.If the world temperatures ....................to rise, there will be less snow. A. continue B. will continue C. would continue D. be continue 6.It is possible to save the Earth if we ................action now. A. not take B. won’t take C. wouldn’t take D. don’t take 7.How .....................you travel to work if you didn’t have a motorbike. A. will B. can C. would D. do 8.There wouldn’t be any flowers if my sister .....................of it every day. A. doesn’t take care B. didn’t take care C. will not take care D. can’t take care 9.I am looking forward to .........................you then. A. to see B. seeing C. see D. seen 10....................is closest to the North Pole. A. America B. New Zealand C. Australia D. Canada 11.Household dump waste into the river ………….it is polluted. A. because B. so C. since D. as 12.The famous Sydney Opera House .....................as an arts centre in 1973. A. serve B. has served C. is served D. was served 13. The Americans .............Thanksgiving Day on the fourth Thursday of November since 1864. A. celebrate B. to celebrate C. was celebrated D. have celebrated 14.An example of a natural disaster is a ………………. A. snowfall B. tornado C. thunder D. rainbow 15.Debris .............across the countryside by strong winds last night. A. scattered B. is scattered C. was scattered D. scatter 16.In the future natural disasters ...................predicted accurately with the help of technology. A. be B. has be C. has been D. will be 17.Food and medical supplies will be .....................late this afternoon. A. deliver B. delivered C. delivering D. to deliver 18.Most people ................before the storm came. A. has left B. have left C. had left D. left 19.Hundreds of people were made ……………….after the flood. A. homeless B. helpless C. careless D. endless 20.What had you .........................before you went to bed last night? A. done B. did C. do D. to do II. Find mistakes. 1.What had you done before you have dinner yesterday.? A B C D 2.By the time we arrived at my hometown, it stopped raining. A B C D 3.Factories won’t dump the waste into the rivers if the government fine them heavily. A B C D 4.More people have fresh water to use if we use water carefully. A B C D 5.If you are the president, what would you do to help the environment? A B C D 6.If I am you, I’d look for a new place to live. A B C D 7.Last year we have a wonderful time at a summer camp in Britain. A B C D 8.Residents of flooded area was taken to a safe place last night. A B C D 9.Food and blankets will be buy for earthquake victims. A B C D 10.A new hospital have been built by the workers since last month. A B C D giúp mìn với