用括号内所给单词的适当形式填空。（5分）
【小题1】Children know that an elephant is much bigger (big) than a dog.
【小题2】You should wash your feet (foot) before you go to bed every day.
【小题3】Thank you a lot for inviting (invite) me to your birthday party.
【小题4】There are many differences (different) between the two pictures.
【小题5】Tom’s parents enjoy listening (listen) to the country music.
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解析：
【小题1】联系下文than a dog.可知填比较级bigger，注意以重读闭音节结尾的单词变比较级时要双写最后一个辅音字母。
【小题2】联系前文your可知填复数形式feet，因为一般人都是两只脚。
【小题3】for是介词后面一般接名词或者动名词做介词宾语。故填动名词inviting，表示抽象动作。
【小题4】联系前文形容词many，许多的，可知填复数名词differences。
【小题5】enjoy后面一般接名词或者动名词表示喜欢做某事。故填listening。