摘要：2．Listen! The bird on a tree．

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Listen! The bird in the tree.

A．sing

B．singing

C．is singing

D．is sing.

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Listen! The bird in the tree.

A.
sing
B.
singing
C.
is singing
D.
is sing.

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Listen! The bird in the tree.

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Listen! The bird ________over there.

A.
singing
B.
are singing
C.
is singing
D.
sing

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Listen! The bird _____ in the tree.

A. is singing B. sing C. singing D. is sing

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