用所给词的适当形式填空。

1. The children are singing and dancing ____(happy) on the playground.

2. We enjoyed _________( oneself) in the park last Sunday.

3. The workers ________ ( produce) a new kind of machine.

4. But I _______ ( real) cannot go to town with you tomorrow.

5. I'm ______( especial) busy this morning. What about this afternoon?

6. Throw it away. It's quite _________( worth) .

7. Could you give me some _________( advice) on this problem?