Ⅰ.单词拼写
1．What is his r________ with your suggestion?
答案：reaction
2．A good sleeping bag is an essential part of e________.
答案：equipment
3．Milk is ________ (液体)．
答案：liquid
4．The members of the club discussed the problem for a whole afternoon, but they didn't come to any c________.
答案：conclusion
5．When you heat a metal, it e________.
答案：expands
6．It is of great ________ (重要) to learn English well.
答案：importance
7．I wonder if different ________ (物质) will react.
答案：substances
