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液压传动所用的工作介质是什么？液压工作介质的用途有哪些？

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There are_______apples at home. Let’ s go and buy some.

A. a few
B. few
C. a little
D. little

—Which subject do you like_______?—Computer.

A. well
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—Is Jim in the library?—No, he_______in the gym.

A. dances
B. dancing
C. is dancing

They are playing________basketball on the playground.

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