Our knowledge of________universe is growing all the time.
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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
Someone says there is no air________water on________Jupiter(木星).
A. and; /
B. or; /
C. and; the
D. or; the