Studies show that people are more to suffer from back problems if they always sit before computer screens for long hours.
| A．possible | B．likely | C．probable | D．sure |
What idea can a man who is blind from birth have_____ color?
| A．in | B．/ | C．with | D．of |
I don' t know ____ to stay at home or go out.
| A．whether | B．if | C．how | D．where |
The train leaves ____ 6: 00 p. m. So I have to be at the station ____ 5:40 p. m. at the latest.
| A．at; until | B．for; after | C．at;by | D．before; around |
____ he will come or not is still unknown.
| A．If | B．Where | C．That | D．Whether |
We offered him our congratulations ____ his passing the college entrance exams.
| A．at | B．on | C．for | D．of |