4.（填空题）理论以实践为基础，又反过来服务于实践。Theory is based on practice and _________serves practice.

36.（填空题）电子商务的成功在于完全实现了在线支付功能。The success of e-commerce _________ completely realizing online payment.

35.（填空题）我们应该留一点钱已备不时之需。We should ______ an amount of money in case something unexpected happened.

34.（填空题）专家们认为不断增加的死亡率与开车有关。Experts believe that the increaseing rate of death __________ driving cars.

33.（填空题）越来越多的不可再生能源的使用将对全球未来的发展带来负面的影响。The increased use of non-renewable energy will ___________ global developmen in the future.

32.（填空题）一条新规则很快就要出台了。A new rule will soon_________________ .

31.（填空题）我们决不能对他们的要求让步。We must not ___________ their demands.

30.（填空题）营养不足导致生产力低下。Poor nutrition leads to__________ .

29.（填空题）她是一个紧跟最新时尚的女孩。She is a girl who is eager to follow ___________ fashions.

28.（填空题）没有常识的知识没什么价值。Knowledge without __________ counts for little.

27.（填空题）新鲜空气对健康是不可缺少的。Fresh air is____________to good health.