II. 单项选择 (满分15分)
21. ----Can I look at the menu for a few more minutes before I decide?
----Of course. ______, sir.
A. Make yourself at home B. Take your time
C. It doesn’t matter D. Enjoy yourself
22.----Look! Where ______ you _______?
___Sorry. I wasn’t noticing.
A. are…going B. do… go C. did…go D. were…going
23. Without electricity human life ______ quite difficult today.
A. is B. will be C. would have been D. would be
