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.