用括号内所给单词的适当形式填空。
1.It is said swimming in this river is very _________(danger).
2.We can do the work with _________(little) money and fewer people than they can.
3.Many people made a _________(decide) to Qinghai to be volunteers(志愿者)after the earthquake.
4._________(luck),1 won the first prize at the speech contest(比赛).
5.His grandfather is a famous _________(science).
6.Children find it hard to think for _________(them) because of their parents' plan.
