The thief trapped in the house _____ from the window but the fear of falling to his death scared him not to do so.
| A．managed to escape | B．tried to run |
| C．attempted to escape | D．tried escaping |
____you don’t like him is none of my business.
| A．What | B．That | C．Who | D．How |
____he will go to work in a mountain village surprises all of us.
| A．What | B．That | C．Whether | D．If |
_____more countries can use natural energy in the future remains to be seen.
| A．Whether | B．This | C．who | D．If |
It worried her a bit _____her hair was turning gray.
| A．while | B．if | C．that | D．for |
.____the meeting should last two days or three days doesn’t matter.
| A．That | B．Whether | C．If | D．Where |