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1. By the time the rescue team arrived, the hikers _______ in the snow for over ten hours.
had been waiting
have waited
will have waited
were waiting
2. Water _______ at 100 degrees Celsius, but the water in this pot _______ yet.
boils; isn't boiling
is boiling; doesn't boil
boils; hasn't boiled
boiled; didn't boil
3. Look! The train _______! Hurry up, or we will miss it.
is leaving
leaves
left
has left
4. I _______ the laptop for three years, and it still works perfectly now.
am having
had
have been having
have had
5. Don't make so much noise. My father _______ a very important business call in the study right now.
is taking
takes
has taken
will take
6. My brother _______ a terrible stomachache last night because he _______ too much junk food that afternoon
has had; ate
had; had eaten
had had; had eaten
had; ate
7. As soon as the boss _______ back tomorrow, we will start the meeting immediately.
comes
will come
came
is coming
8. While Leo _______ his homework in his room, he suddenly heard a loud noise from the kitchen.
is doing
has done
was doing
did
9. I _______ my keys! Have you seen them anywhere?
have lost
lost
lose
had lost
10. The museum _______ at 9:00 AM every day, so we don't need to rush right now.
opens
opened
will open
is opening
11. Karen _______ English in Tokyo for five years before she moved to Taiwan last year.
was teaching
taught
has taught
had taught
12. I don't know if it _______ tomorrow, but if it _______, the picnic will be canceled.
will rain; will rain
will rain; rains
rains; will rain
rains; rains
13. At this time yesterday, we _______ a barbecue in the backyard while it was raining cats and dogs.
had
were having
have had
had had
14. Eric _______ to Paris twice this year, and he plans to visit it again this winter.
had been
went
has gone
has been
15. I cannot go to the movies with you because I _______ my project tonight.
haven't finished
am finishing
finished
finish
16. Listen! Someone _______ beautiful music on the piano next door.
plays
has played
played
is playing
