1.Water may change from a (液体) to a solid.
答案:liquid
2.After the war the army continued to (扩大).
答案:expand
3.Objects expand when heated and (收缩) when cooled.
答案:contract
4.Soil is made up of various chemical (物质).
答案:substances
5.Air is a (混合物) of gases.
答案:mixture
6.Waterpower has been widely used to generate (电).
答案:electricity
7.We should take no action at this (阶段).
答案:stage
8.We drew this (结论) on the basis of experiments.
答案:conclusion
9.Our (目的) is to make books available to all.
答案:aim
10.Her parents’ (反应) to the news was surprisingly calm.
答案:reaction
11.The ship was provided with radar (设备).
答案:equipment
