B)下列5题中的句子可以组成一篇小短文,请从所给的四个选项中选出可以填入空白处的最佳答案。(答案涂在答题纸上)Faraday made the ________ electric motor in 1821. It was an invention that used electricity to produce movement. A. obvious B. social C. mad D. first
—Jack can't concentrate on his lessons recently. —Yes, that might ____ why he did so badly in the last test.
Theytwo free tickets to Australia, otherwise they’d never have been able to afford to go.
Not until they left school how much their teachers loved them and helped them.
This new kind of chemicals will help keep the air, soil and water________ from pollution.
---I have cleaned the room three times a day. Look, It is a mess again. ---! Wait until the children go to bed.