根据句子意思，用括号中所给单词的适当形式填空。
The time is too short. It’s        (possible) for Daniel to finish this work.
Mother’s Day is coming. He’ll use what he has        (buy ) his mother a new dress.
Take care, children. Don’t hurt        (you) when you play football.
I’m surprised that Gavin is 50. I thought he was        (young), for he seems to be in his thirties.
Are you satisfied with these        (sing) performances in the opera?