By the time he was 12, Edison _______ to make a living by himself.
A. would begin
B. has begun
C. had begun
D. was begun
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I _______ my breakfast when the morning post came.
A. had
B. had been having
C. haven been having
D. was having
-Must I stay here for hours?-No, you _______, You can leave any time.
A. mustn’t
B. needn’t
C. can’t
D. wouldn’t
Mary _______ be at home. I saw her in the library just now.
A. mustn’t
B. needn’t
C. shouldn’t
D. can’t
Before 2010 we will finish _______ the park.
A. build
B. built
C. building
D. to build
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