Question

用所给词的适当形式填空。 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．

Answer 1

答案：
解析：

1．答案：to catch 　　解析：不定式作目的状语。 　　2．babies 　　3．答案：to speak 　　解析：不定式是真正的主语，it是形式主语。 　　4．left 　　5．答案：to invite 　　解析：不定式作真正的主语。