An agreement __________ be reached when the other side raised new problems.
| A．was to | B．was going to |
| C．was about to | D．would |
The reason ___he didn’t come was ____he was injured.
| A．that, because | B．why, that | C．why, because | D．that, that |
Mother shut the window ______ she might keep the insects out.
| A．because | B．in order that | C．till | D．as |
Mr. Herpin is one of the foreign experts who ___in China.
| A．works | B．is working | C．are working | D．has been working |
Anyone can borrow books from this library _______ he keeps them clean and returns them in time.
| A．even if | B．unless | C．so that | D．as long as |
So fast _____that it is difficult for us to imagine its speed.
| A．light travel | B．is light travel | C．does light travel | D．travels light |