摘要：情态动词的过去式用于现在时态时.表示说话人的谦虚.客气.有礼貌.或委婉的语气.常用于日常会话中.如: Would you be kind enough to show me the way to the post office? 请你告诉我去邮局的路好吗? It would be better for you not to stay up too late.你最好别熬夜到很晚.
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根据括号内的要求写出单词的正确形式。
1．graduation(动词)________
7．contribute(名词)________
2．seasonal(名词)________
8．envelope(复数)________
3．traditional(名词)________
9．decoration(动词)________
4．include(现在分词)________
10．reception(动词)________
5．power(形容词)________
11．blow(动词的过去式)________
6．destroy(动词的过去式)________
12．seriously(形容词)________
根据括号内的要求，写出单词的正确形式。
1．responsibility(形容词)________
2．course(名词复数)________
3．prevent(名词)________
4．social(名词)________
5．organize(名词)________
6．support(动词的过去式)________
7．creative(动词)________
8．unexpected(反义词)________
9．switch(动词的过去式)________
10．normally(形容词)________
11．presentation(动词)________
12．solve(动词的过去式)________