【推荐1】He argued ____ the plan. Because it was not practical. （用适当的单词填空）

【推荐2】Many governments have made a prohibition __________using cloning to do something illegal.(用适当的单词填空)

【推荐3】It was a real race________time to get the project done.Luckily，we made it.

【推荐1】Most smokers say they benefit from smoking to some degree but health experts suggest that they should give it up _________the benefit of their health. (用单词适当形式填空)

【推荐2】Life has a limit, but knowledge is_____________ limit. (用适当的词填空)

【推荐3】The land varies in height from 700 metres above sea level_______over 2, 000 metres.（用适当的词填空）