根据句子意思，用括号中所给单词的适当形式填空。

小题1:My little cousin, Jimmy, is much __________ (slim) than before.

小题2:Today is the old couple’s _________ (forty) wedding anniversary (纪念日).

小题3:How ________ (active) they are donating money to help the sick student !

小题4:It’s ________ (correct) that some grandparents carry school bags for students

小题5:Teenagers should be encouraged to make decisions by      (them).

Tyron was very angry, but coolheaded enough to ________ rushing into the boss's office.[ ]

A．prevent  

B．avoid

C．protect  

D．allow