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?
