Being a teacher always encouraging students to think for themselves, I won't tell them answers until they __________ on a math problem for more than an hour.
| A．have worked | B．will have worked |
| C．will have been working | D．had worked |
There is a(n) _______ bus service into the center of town, which makes it much easier for farmers to go to sell their vegetables there.
| A．frequent | B．gradual | C．official | D．fluent |
Could I have a(n) ______ word with you, Mr. Thomas? It won’t take up too much of your time.
| A．honest | B．straight | C．simple | D．brief |
Those who suffer from headache will find they get ______ from this medicine.
| A．relief | B．safety | C．worth | D．shelter |
It is a great ________ for a person to be able to drive when he is looking for a job.
| A．benefit | B．chance | C．advantage | D．fortune |
--- How was the dance?
--- __________.
| A．That’s OK. | B．Don’t mention it. |
| C．I’d love to. | D．It was so much fun. |