21. ---There is an examination tomorrow and I couldn’t fall asleep last night.
---_____.
A. I see you B. I understand you C. Don’t be afraid D. Take it easy
22. _____ private car is becoming _____ popular means of transportation.
A. The; a B. /; the C. The; the D. A; a
23. _____ for your laziness, you could have finished the assignment by now.
A. It were not B. Were not it C. Had it not been D. Had not it been
