Ⅰ.拼写单词
1．What sort of substance (物质) could withstand those temperatures?
2．He has only one aim (目的) in life — to become rich.
3．At this stage (阶段) it's impossible to know whether our plan will succeed.
4．When water boils (沸腾) it turns into steam.
5．Metals contract (收缩) as they get cooler.
6．The substances are formed (形成) from a mixture of liquids solidifying (凝固) under pressure.
7．We were dressed up for the party but she was still in her ordinary (普通的) clothes.
8．His modest business eventually expanded (扩展) into a supermarket empire.
9．If you add too much liquid (液体), the mixture will not be thick enough.
