从A、B、C、D四个选项中，选出可以填入空白处的最佳选项，并在答题卡上将该项涂黑。
6. — Would you like to go with me and have an outing this afternoon?
— , but I will have something important to do.
A. No, I can’t B. Yes, thanks C. I’d love to D. It’s a pleasure
7. They report big increase in number of Americans who attend university classes in the evening or at night.
A. a; the B. the; a C. a; a D. the; the
8. Suddenly and telling anyone, the guest left.
A. with B. in C. without D. for
