1 . 每当有客人来访，给他们沏杯茶是最基本的社交习俗。(动词不定式作主语)
It is a basic social custom ___________to them whenever guests visit.

2 . 令人惊讶的是，简单的肢体动作竟会对我们的思考方式影响这么多。(it引导的主语从句) （汉译英）
_________________________________________________________________________________

3 . There is some doubt ______ Professor Smith can make it to the conference. ______ is said that his flight has been canceled because of the heavy snow.

A．that; It

B．that; That

C．whether; It

D．whether; That

4 . 如果你正在读这篇文章,   那么很可能你花费了很多时间在网上。

If you’re reading this article, ________________ you spend a fair amount of time online.

5 . 人们相信他还没有完全发挥他的潜力。(it作形式主语)
____________ he has not yet reach his full potential.

6 . ___________________________ because I am very outgoing.
对我来说，交朋友很容易，因为我很外向

8 . 在黄金时段的电视上投放广告是非常品贵的。(advertise:peak) (汉译英)