________ he discovered in his experiment is very important to us.
A. That
B. When
C. What
D. Where
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Bob went house-hunting for a week but still he didn’t find a room ________.
A. to live
B. for living
C. to be living in
D. to live in
The teacher objected to students’ ________ their opened umbrellas near the door.
A. setting
B. to set
C. having set
D. set
________ in bed for several hours, he felt much better.
A. Having lain
B. Having laid
C. Laying
D. Lying
He made the request that the problem ________ at the meeting.
A. is discussed
B. discusses
C. be discussed
D. will be discussed
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