21．—Since you can't find a better way out for the time being，why not follow his advice?
—Oh， ．
A．I believe not B．I might as well C．It doesn't matter D．I don't care
22．—Shall we go out for walk?
—Sorry．This is not the right ．I am too tired to walk．to invite me
A．a；moment B．the；situation C．a; place D．／; chance
