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．in keeping
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单项选择题
The meeting was (interesting) (to) some people, (and) to me it was (boring).
A．interesting
B．to
C．and
D．boring
单项选择题
Mary showed the (customs) officer her passport, (then) John showed (him) (his one).
A．customs
B．then
C．him
D．his one
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