She shut the window ________ she might keep the insects out.
A. because
B. in order that
C. till
D. as
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He hurried to the mayor’s office, ________ why he needed to talk to him at such a late hour.
A. wondering
B. wondered
C. wonders
D. wonder
It was after he had a thorough investigation ________ came to know the actual state.
A. where he
B. that he
C. when he
D. and he
The letters I receive from my classmates in America ________ me think that it is a wonderful place to live in.
A. had made
B. make
C. makes
D. made
Anything ________ should be returned to the owner.
A. borrow
B. borrowed
C. borrowing
D. to borrow