用所給詞的適當形式填空。

1．He got up early enough ________(catch) the train．

2．We try to help pandas produce more ________(baby)．

3．It is necessary ________(speak) English in and out of class．

4．There isn't any food ________(leave) on the table．

5．It's very nice of you ________(invite) me．

答案：
解析：

　　1．答案：to catch

　　解析：不定式作目的狀語。

　　2．babies

　　3．答案：to speak

　　解析：不定式是真正的主語，it是形式主語。

　　4．left

　　5．答案：to invite

　　解析：不定式作真正的主語。


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