----Did Peter fix the computer himself?
-----He ________, because he doesn't know much about computers.
| A．has it fixed | B．had fixed it | C．had it fixed | D．fixed it |
The fact that many college graduates get lower pay than some workers has ______ a heated discussion.
| A．set out | B．set about | C．set up | D．set off |
I have no idea ______ it is that makes him puzzled.
| A．how | B．what | C． why | D．which |
He sat at the desk, __________ a novel.
| A．read | B．to read | C．reading | D．reads |
______ tourism developing, more and more people prefer to go travelling for a holiday.
| A．As. | B．With | C．Upon | D．For |
.--- I was lucky the win a gold medal in the800-metre race.
--- You ____ through hard training.
| A．must go | B．should go | C．must have gone | D．should have gone. |