21. If you go by _____ train, you can have a comfortable journey, but make sure you get _____ fast one.
A．the; the B．不填；a C．the; a D．不填；不填
22. –Got your driving license?
–No. I _____ too busy to have enough practice, so I didn’t take the driving test last week.
A. had been B. am C. have been D. was
23. –May I use your bicycle?
–______. It’s in the yard.
A. Come on B. It depends C. That’s all right D. Go ahead
