1. 即使天下雨的时候,他也练习打篮球.
    He _________  _________ basketball even when it __________.
2. 他们轮流打扫教室.
    They __________  __________  __________  __________ the classroom.
3. 我们必须是孩子们远离河和湖.
    We must __________ children __________  __________ rivers and lakes.
4. 知道长颈鹿用舌头清洁耳朵是有趣的.
    __________ is __________  __________ learn that giraffes clean there ears with their __________.
5. 你上次考试太粗心了,下次应该更仔细些.
    You were too __________ in your __________ exam, You __________  __________ be __________ 
    ___________ next time.

1. 谢谢你邀请我参加你的生日聚会。 　
   Thank you _____ asking me to your birthday  _____. 　
2. 瞧！农民们正忙着在田间干农活。　　
　Look! The _____ are _____ doing farm work in the fields. 　　
3. 医生告诉我这种药一天服三次。　　　　
    The doctor told me _____ take this medicine _____ a day. 　　
4. 如果明天不下雨的话，我将和父母一起去动物园。　　　
　 I'll _____ to the zoo with my parents _____ it doesn't rain tomorrow. 　　
5. 这些机器是中国制造的，他们在世界上很受欢迎。　　　　
    These machines are _____ in China. They are very popular in the _____.