Look, they seem _____ about you.
| A．talk | B．to talk | C．to be talking | D．to be talked |
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 |
He will come ____ you ask him.
| A．whether | B．unless | C．if | D．while |