If it was not an accident, he must have done it .
| A．on purpose | B．in common | C．on occasion | D．in time |
---I came all the way to inform you of the time and place of the meeting.
---You could have _____ yourself the trouble.
| A．shared | B．spared | C．cost | D．removed |
The fact has worried many scientists _____ the earth is becoming warmer and warmer these years.
| A．which | B．that | C．as | D．what |
It is required that each restaurant have signs on the walls,saying “ _____ your steps!”.
| A．Watch | B．Notice | C．Mind | D．Care |
--- I think you should apologize to him.
--- _____. I’d apologize to anybody but him.
| A．No way | B．No problem | C．No wonder | D．No doubt |
I want to go to college and become a doctor; _____ is my wish.
| A．so | B．such | C．as | D．what |