单项选择题

He didn't realize the value of friendship ______ he had lost it.

A．if
B．as
C．while
D．until
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单项选择题
-- I'm looking for a bread-knife ______.-- I saw Tim ______ a pencil with the knife a minute ago.
A．to cut the loaf; sharpen
B．cutting the loaf; sharpen
C．to cut the loaf with; sharpening
D．cutting the loaf with; sharpening
单项选择题
Most of the people ______ to the dinner party were famous scientists.
A．invited
B．being invited
C．to invite
D．inviting
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