Studies show that people are more to suffer from back problems if they always sit before computer screens for long hours．
| A．likely | B．possible | C．probable | D．sure |
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 |
He will come ____ you ask him.
| A．whether | B．unless | C．if | D．while |
I made the coat ____ my own hands. It was made ____ hand, not with a machine.
| A．in; in | B．in; with | C．with; by | D．with; with |