the students came from different countries, they got along quite well in the summer camp.
| A．While | B．Unless | C．Since | D．Until |
.------ He has promised to come to see you.
------ But he ______. I’ve been all alone.
| A．didn’t | B．hasn’t | C．won’t | D．wouldn’t |
The media can often help solve problems and draw attention to situations ______ help is needed.
| A．when | B．how | C．which | D．where |
She ______ his number in the phone book to make sure that she had got it right.
| A．looked up | B．looked for | C．picked out | D．picked up |
I think physics is ________ and difficult ________.
| A．confused; to learn | B．confusing; to be learned |
| C．confused; to learn it | D．confusing; to learn |
An oil tanker hit a rock ______ the northwest coast of Alaska.
| A．on | B．in | C．off | D．to |