根据句意及各题括号中所给的汉语意思，从下面的方框中选择合适的单词或词组，用其适当形式填空。

1．We'd better drink ________(烧开的)water, or we'll be sick．

2．The ________(设备)of our factory is worth ＄100 000．

3．Weigh it on the ________(天平)．

4．This machine is driven by ________(电)．

5．Ice ________(形成)at 0℃．

6．We were dressed up for the party but she was still in her ________(平常的)clothes．

7．We came to the ________(结论)that the room must have been empty．

8．Iron has ________(部分)reaction with water．

9．The ________(目标)of the experiment is to find out which of the metals doesn't react with water．

10．He noticed a piece of wood ________(漂浮)on the water．

11．Air is a ________(混合物)of gases．

12．Sugar ________(溶化)in water．

13．Any object ________(膨胀)when heated in water．

14．Metals ________(缩小)as they get cooler．

15．Chemical changes can produce new ________(物资)．

16．Putting an acid and a metal together causes a ________(反应)．

17．The ________(设备)for teaching in our school are very advanced．

18．There are a lot of great men in our nation that we ________(为……感到骄傲)．

19．We all felt ________(惊奇)on hearing she was injured in an experiment．

20．She ________(应该)do the chemistry experiment carefully．

用动词的适当形式填空

Who will get the prize ________(not decided)yet．

用动词的适当形式填空

It is the second time that he ________(get)the prize．

用动词的适当形式填空

He ________(live)here since he came back from America．

用动词的适当形式填空

He is now twelve, but he ________(not see)his father so far．

用动词的适当形式填空

It has been two days since he ________(leave)the home．

用动词的适当形式填空

He is one of the kindest person that I ________(see)in his life．

用动词的适当形式填空

This is the first time I ________(do)such a difficult job．

用动词的适当形式填空

He ________(finish)writing the composition up to now．

完成句子

(1)I'm not going．To begin with I haven't a ticket, and ________(二来我不喜欢这出戏)．

(2)First, it is too expensive, ________(二来它也过时了)．