1．Air, food and drink are necessary __________ (support) life.
[答案] to support
2．You can save a lot if you buy things __________ quantity.
[答案] in
3．An hour later, I woke up suddenly with the solution __________ (clear) in mind.
[答案] clearly
4．At the age of thirty, Samuel became a professional astronomer and __________ (earn) an international reputation.
[答案] earned
5．He tried to make __________ clear to his paretns that he didn't like the job at all.
[答案] it
6．Whoever breaks the law won't escape __________ (punish)．
[答案] being punished
