XI- Make a cross on the correct answer A, B, C, or D in the following sentences : (chưa) 1- Air _______________ is often seen as a major environmental result of modern living. A. pollution B. smoke C. fume D. sewage 2- These vegetables are poisonous; they are _____________________ . A. eatable B. adible C. inedible D. eaten 3- ________________ are used to kill insects and weeds so as to help crops grow better. A. Pesticides B. Dynamite C. Treasures D. Creatures 4- We can protect our environment save a lot of money by buying ___________________ products. A. used B. recycled C. waste D. recycling 5- If we plant more trees along the streets, we ___________ the amount of pollution in the atmosphere. A. reduce B. reduced C. will reduce D. would reduce 6- The baby laughed ____________________ when her mother told her a funny story, A. happy B. happiness C. unhappy D. happily 7- Tuan spoke English ____________________, but he didn’t win first prize in the competition, A. unwell B. good C. well D. bad 8- I failed my exam. I worked really hard for it. I’m so _________________________ . A. disappointment B. disappoint C. disappointed D. disappointing 9- ___________________ the pollution in that river is awfully bad, the water is not fit to drink. A. Because of B. Since C. When D. Although 10- We _________________ up our neighborhood when that conservationist arrived. A. cleaned B. cleaning C. are cleaning D. were cleaning 11- While Hoa was picking up the broken plates, she ____________________ her finger. A. cut B. was cut C. was cutting D. is cutting 12- I fell and hurt myself ___________________ I was playing tennis. A. while B. during C. if D. because 13- Keep ______________ your mother for a valuable gold ring until she says yes. A. asking B. to ask C. and ask D. ask 14- We are really looking forward _________________ you again. A. to see B. seeing C. to seeing D. for seeing 15- This man __________________ 50,000 VND yesterday for cutting down the trees in the forest. A. was fine B. has been fined C. fined D. was fined