Online shopping , when properly ____, ca

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问题选择题

Online shopping , when properly ____, can save a lot of time , money and energy.

A．done

B．is done

C．having done

D．doing

答案

答案：A

考查状语从句的省略。此题when后面省略了it is,句意：网上购物当适当使用的话，会节省许多时间，金钱和精力。故选A。

听力题

根据中文形式，填出单词的正确形式。（5小题，每小题2分，共10分）

小题1: Han Han is as ________________(受欢迎的) as Guo Jingming.

小题2: Teachers are usually _______________（严格的）with their students in class.

小题3: People around the world love _____________(和平) and hate wars.

小题4: Lucy often learns French by _______________(自己) after school.

小题5: The last month of a year is _______________(十二月).

填空题

一氧化碳在空气中的安全含量是（）它是无色味的气体。