75．Children need organized activities, and they also need time and 　　　　　　to relax．

74．Many athletes give money to schools and 　　　　，and do a lot of work to help people．

73．You are 　　　　　　to work harder this semester．

72．I had an 　　　　　　with my best friend yesterday．

A)用方框内所给单词的适当形式填空。每空格限填一词，每词限用一次。

71．Dr Alice says that children may find it hard to think for 　　　　　when they are older．