题目内容

Look! Jimmy with her mother ___ over the bridge.

A. is walking
B. are walking
C. walk

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— Where’s Tom?— He ___ his homework at home.

A. do
B. does
C. is doing

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A. are sleeping
B.is sleeping
C. are sleep

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A. to cross
B. crossing
C. across

Listen! Someone is ___ in the dark.

A. sing
B. singing
C. sings