41．Simon and Linda asked each other to keep their secret to _________（他们自己）．

40．Tom had an accident yesterday．His teacher sent him to the hospital _________（quick）．

B）根据句意及汉语提示，写出各单词的正确形式，每空一词。

39．There are many kinds of dictionaries in the bookstore．I have difficulty _________（choose）one．

38．--Have you _________（hear）from your pen friend recently?

--No，I'm looking forward to his e-mails．

37．I like listening to light music．It can make me feel _________（relax）．

36．He was such a careless boy that he hurt his two _________（foot）badly just now．