题目内容：

用方框中所给单词的适当形式填空，每个单词限用一次。

him,   sleep,   unless,    secret,    memorize

1.He was so        that he fell asleep soon.

2.You won’t get good grades ____________ you study hard.   

3.Doing lots of listening practice is one of the ____________ of becoming a good learner.

4._____     all the new words in this unit is a bit difficult for me.

5.With his mother’s help, Jim felt good about __________.