用現(xiàn)在進行時完成下列句子。
1. What _____ you _____ (do)?
2. I _____ (sing) an English song.
3. What _____ he _____ (mend)?
4. He _____ (mend) a car.
5. _____ you _____ (fly)a kite? Yes, _____.
1. are, doing
2. am singing
3. is, mending
4. is mending
5. Are, flying, I am
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