单项选择题

There is no doubt that he is a good professor ______ he is doing fine.

A. but
B. because
C. so
D. yet
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单项选择题
We have got only five textbooks for the children ______ we need ten. So I'm afraid they will have to share.
A. because
B. since
C. when
D. once
单项选择题
______ I wrote a little poem, I confidently placed it right on my father's plate on the dining room table.
A. The first time
B. At first
C. It was the first time
D. For the first time
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