看圖畫，從方框中選擇合適的單詞補(bǔ)全下列句子。
are    is     sing    play     cry     laugh
1. What is he doing?
He is ____________ing.
2. What is she doing?
She ____________ ____________ing.
3. What are they doing?
They ____________ ____________ing.
4.

What is she doing?
She is ____________ing.

1. sing  2. is, cry  3. are, play  4. laugh
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