When asked to explain _____ he did to make his students so fascinated with his lessons, the teacher paused and thought deeply.
| A．what was it that | B．that what it was | C．what it was that | D．what was it |
The hill ____ is covered with tress is called Huang Hill.
| A．of which top | B．whose the top |
| C．whose top | D．top which |
Progress so far has been very good, ____, we are sure that the project will be completed on time.
| A．otherwise | B．therefore | C．besides | D．however |
All of us don’t believe the fact__ our best student failed in the competition.
| A．that | B．which | C．when | D．why |
-----I forget the name of an old school friend at the party.
-----_____. It must have been very embarrassing.
| A．Take it easy | B．That’s too bad |
| C．Nothing serious | D．Don’t mention it |
It is reported that Russia uses____ energy as Uklaine.
| A．as twice much | B．twice as much | C．twice much as | D．twice much |