用括号内所给的适当形式填空。 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.