题目内容

It happened on ________ winter night.

A. /
B. the
C. an
D. a

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Our knowledge of________universe is growing all the time.

A. an
B. a
C. the
D. /

In 1947 a pilot saw________UFO flying in________sky.

A. a; the
B. an; the
C. a; /
D. an; /

Jane can play not only________piano but also________tennis.

A. /; the
B. the; the
C. the; /
D. /; /

There is a tree ________the house.

A. in front
B. in the front of
C. in front of
D. on front of

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