单项选择题

(Ever since) the world (began) nations (have difficulty) in (keeping) peace with their neighbors.()

A. Ever since
B. began
C. have difficulty
D. keeping

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I'll take this opportunity to roam about the streets, to get in touch with the local people, ______.
A. so to speak

B. so as to
C. as a matter of fact

D. as a result
单项选择题
She has no pencil ______.
A. to write about
B. to write with
C. to write
D. to write in
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