21.—Imagine you are outside when earthquake comes. What should you do?
— Go to open space away from buildings or tree.
A. the; the B. the; an C. an; the D. an; an
22. —Would you like to go for an outing with us?
— , for I have something important to do.
A. I will B. I'd love to C. I don't know D. I'd rather not
