11._______(装一半) the test tube with water. 12._____(加) some oil ____ the water. This will ____ air _____ (把…挡在外面) the water. 13.Iron doesn’t rust in ________(不含空气的) water. 14.It weighs __________(多一点) than before. 15.Our chemistry teacher takes us to public science lectures about __________(一学期四次), and …interesting, as the lectures are people who have __________________ ____________________(在他们的科学领域中真正有所发现). 16.Canada has many __________________(一流的科学家). 17.________________(在最近20年中), seven Canadian scientists ________(获得) the Nobel Prize. 18.So we should ___________(感到骄傲) that. 19….either Montreal or Ottawa, as both ______________(被认为) have good physics departments. 20.My parents are __________(很吃惊). They always ________(原以为) I would become an English teacher.

Half-fill

Add

to

keep

out of

air-free

a little more

4 times a term

made real discoveries

in their area of science

first-class scientists

In the last 20 years

have won

be proud of

are supposed to

astonished

thought