鲫鱼适于水中生活的特点（至少3条）

同义句转换。

1. The children had fun at the party.

    The ______ children______ at the party.

2. My favourite subject is English.

    I  ______ English ______of all the subjects.

3.What's the meaning of "fast"?

    ______ "fast" ______?  

4. You can post a letter in an envelope.

    You can ______ in an envelope.

5.The room is filled with people.

    The room ______ people.