Choose the best answer to complete each of the following sentences

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Ex. 3 Choose the best answer to complete each of the following sentences.
1. Mr. Brown_
A. has already left B. already leaves C. already left
for the day when the phone call came.
D. had already left
the package when she discovered the address was wrong.
D. would mail
2. Ms. Hoa
A. had mailed
B. has mailed
C. will mail
in the sitting-room for hours when he finally came home.
C. will be sitting D. sat
3. We
A. had been sitting B. have sat
4. Before the cancellation letter arrived, they
the goods.
D. had been sending
A. send
B. had sent
C. have sent
5. The accident happened when one of the workers_
A. was cleaning B. were cleaning C. cleaned
6. The Astronauts Memorial Foundation honours all American astronauts
lost their lives on missions or in training.
the chemical tank.
D. had been cleaning
have
A. whom
B. x
C. which
D. who
7. He's so brilliant and he can do anything.
A. Out of this world
C. I's over the moon
8. Europe's biggest ISS project is the Columbus science laboratory
carry out scientific experiments in weightless conditions.
B. The sky's the limit
D. Once in a blue
astronauts can
A. there
B. which
C. where
D. when