If we throw trash on the road, we ........... our environment

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11. If we throw trash on the road, we ........... our environment.
A. will pollute
B. pollute
12. Someone ........... at the door. Can you hear it?
A. knocks
B. is knocking
C. will knock
13. It's an hour since he ..........., so he must be at the office now.
A. is leaving
C. has left
B. was leaving
14. Most students ........... hard for the last few weeks.
B. worked
C. are polluting
A. were working
15. He ........... up his mind yet.
A. didn't make
16. The baby
..... non-stop for the last two hours.
B. was crying
A. cried
17. London........... the capital of the United Kingdom.
A. is
B. was
C. will be
18. Yesterday, I ........... to a souvenir shop near the exit of the aquarium.
A. go
B. gone
C. went
19. He ........... in the same house since 1975.
A. has lived
B. is living
20. At this time next week, we .........
A. install
B. installed
B. hasn't made
C. are working
C. wasn't made
C. is crying
C. lived
a wind turbine in our garden.
C. will installed
D. polluted
D. was knocking
D. left
D.have been working
D. wasn't making
D. has been crying
D. is being
D. goes
D. had lived
D. will be installing