The students respect their head teacher ，although she is strict，she is fair．
| A．since | B．for | C．that | D．because |
How did you ___ to paint the whole house in a week?
| A．try | B．manage | C．win | D．succeed |
Black clouds had completely ___ the sun.
| A．blocked off | B．broken out | C．blocked out | D．broken off |
It was an unpleasant subject ____ we _____ for a long time.
| A．about which…discussed | B．about which…argued |
| C．over them…argued | D．which…argued |
It must have rained last night, ________ the ground is wet now.
| A．for | B．because | C．since | D．now that |
The serious expression of the captain kept his crew _________.
| A．in the distance | B．from a distance | C．in a distance | D．at a distance |