16. Dont put the waste on the ground.
Oh, Im very sorry. I _____the dustbin there.
A. dont see B. isnt seeing
C. didnt see D. havent see
17. How is the weather in your country this summer?
It _____as much as it does now for a long time.
A. hasnt rained B. doesnt rain
C. wasnt raining D. didnt rain
18. Does Liu Hui serve in the army?
No, but he _____in the army for three years.
A. served B. has served
C. is serving D. would serve
19. Sorry. I _____to post the letter for you.
Never mind. _____it myself after school.
A. forget; Id rather post B. forgot; Ill post
C. forgot; Im going to post D. forget; Id better post
20. Unfortunately, when I dropped in, Professor Smith _____, so we only had time for a few words.
A. has just left B. had just left
C. just left D. was just leaving
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