题目内容

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

A. do
B. does
C. is doing

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Two boys and their mother ___ under the tree.

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

Mary is swimming ___ the river.

A. to cross
B. crossing
C. across

Listen! Someone is ___ in the dark.

A. sing
B. singing
C. sings

— Excuse me. Who ___ eating the bones?— The dogs.

A. are
B. is
C. must