1. (2017·椒江模拟) 用方框中所给单词的适当形式填空。每词限用一次，每空限填一词。

large    three    encourage    unless    safe

1. （1） You can't get good grades  you work hard.

3. （2） The children were  a lot and they decided to try again.

5. （3） How time flies! It is Joe's  year to stay together with us.

7. （4） Dongting Lake is the second  fresh water lake in China.

9. （5） For your , you'd better not travel to South Africa in recent time.