21. ---Mary,_________ Mr Smith wants to see you at the school gate.
--- That is out of ________ question. I’ve never know any Mr Smith.
A. / ; / B. a; the C. the; / D. the; a
22. Drunk driving , which was once a ___________ occurrence , is now under control.
A. general B. normal C. frequent D. particular
23. My headache ________ me．I thought it was going away, but it’s getting worse and worse．
A．kills B．is killing C．was killing D．killed
