1. 从方框中选出下列各句的最佳应答语。

A．Yes，they are． B．They are having an English lesson． C．She is cooking dinner． D．Yes , it is． E．I often go swimming．

1. （1） —What's John's mother doing?

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3. （2） Is your birthday in June?

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5. （3） What are the students doing?

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7. （4） What do you do on the weekend?

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9. （5） Are they doing an experiment?

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