20. ___________ my father is chopping wood in the back garden, I am slicing beef in the chicken.
A. Before                    B. While                      C. When                      D. As soon as
21. As soon as Peter gathers enough information about the protection of endangered species, he ___________ doing his wildlife project.      
A. started                    B. start                        C. starts                       D. will start
22. I turned off the electrical appliances, and then I ___________ home.
A. leaving                    B. left                          C. leave                       D. will leave
23. What did you do after you ___________ around the boutiques?
A. browsed                 B. browse                    C. will browse             D. browsing
24. I returned home ___________ watched my favourite TV show.
A. so                            B. but                          C. and                         D. or
25. My father ___________ throws away rubbish in public. He’s very responsible.
A. often                       B. sometimes               C. always                    D. never
26. There were bumpy roads ___________ I came back to my hometown.
A. when                      B. while                       C. as soon as               D. so
27. I caught the bus to my office instead ___________ using my car this morning.
A. by                           B. in                            C. of                            D. on
28. There was a ___________, so we couldn’t go to Ha Giang.
A. drought                  B. landslide                 C. tsunami                   D. volcano
29. The pilot suddenly saw a volcanic eruption while he ___________ across Stromboli, Italy.
A. was flying              B. is flying                  C. flew                                    D. flies
30. We ___________ home when it began to rain torrentially.
A. was driving                        B. drove                      C. were driving           D. was drive
31. What ___________ you ___________ at 7 p.m. yesterday?
A. was – doing                        B. were - doing           C. did - do                  D. do – do
32. I ___________ out with some of my friends at this time last Monday.
A. was ate                   B. eating                      C. was eat                   D. was eating
33. A magnitude-8 earthquake ___________ his town abruptly, and then many houses and public facilities collapsed.
A. shook                      B. shake                      C. shaking                   D. shakes
34. It’s necessary to prepare an emergency kit before a tropical storm ___________.
A. was breaking          B. broke                      C. breaks                     D. break
35. The flood victims are collecting their personal ___________.
A. thing                       B. property                  C. proper                     D. belonging
36. Natural disasters result ___________ natural processes of the Earth.
A. from                       B. in                            C. with                                   D. by
37. We were driving to the mountains for our vacation ___________ we got stuck in traffic.
A. after                        B. before                     C. as soon as               D. when
38. I was having dinner at 7 p.m. yesterday when the storm suddenly ___________.
A. comes                     B. came                       C. come                       D. was coming
39. The concert ___________ at 9 o’clock tonight.
A. is starting                B. starts                       C. will start                 D. start
40. People should always ___________ awareness of protecting the environment.
A. contain                   B. rise                          C. cover                       D. raise
41. Hien was going window-shopping when the shopping centre ___________ shaking violently.
A. became                   B. become                   C. was become            D. was becoming
42. When there is a ___________ eruption, hot gases and liquid rock pour out from a mountain.
A. volcanics                B. vocal                       C. volcanic                  D. volcano
43. Using public transport is one of the effective ways to ___________ our carbon footprint.
A. release                    B. reduce                     C. increase                   D. get
44. When Helen goes to the supermarket, she usually avoids buying ___________ products such as plastic containers.
A. use-single               B. singled-use             C. single-used             D. single-use
45. Their local rainforest is diverse with thousands of ___________ animals and plants.
A. endanger                B. rared                       C. rare                         D. rarely
46. The chief engineer was ___________ all the workers of the plant at this time yesterday.
A. instructs                  B. instructing              C. instinct                    D. instructed
47. Residents in skyscrapers were frightened when they ___________ a slight shaking for about a few seconds last night.
A. feel                         B. feeled                     C. was feeling             D. felt
48. To prepare for a ___________ disaster, we should make an emergency kit.
A. natures                    B. nature                     C. natural                    D. naturally
49. We almost can’t ___________ when earthquakes will happen.
A. predict                    B. prediction               C. predictable              D. predicts
50. The conservationists are worried about the increase in endangered species ___________.
A. losing                      B. loss                         C. lost                          D. lose
cíu tui ạaa