选择合适的应答语。
（ ）（1） What is he doing?
（ ）（2） Is it cold?
（ ）（3） Are they happy?
（ ）（4） What are they doing?
（ ）（5） May I come in ?
| A．Please come in . |
| B．He is flying a kite. |
| C．They are singing . |
| D．Yes , it is . |
E. No , they are not happy.
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