It was __________ back home after the experiment .
| A．not until midnight did he go | B．until midnight that he didn’t go |
| C．not until midnight that he went | D．until midnight when he didn’t go |
As second-hand smoking is more harmful and dangerous, people want a total _____against smoking in public．
| A．ban | B．brake | C．breakthrough | D．boundary |
-- I didn't realize how popular the restaurant was until I made a reservation the other day.
-- I beg your pardon, but when __________?
| A．was you realized it | B．it was that you realized it |
| C．you realized it | D．was it that you realized it |
It_____ have been Tom that parked the car here, as he is the only one with a car.
| A．may | B．must | C．can | D．should |
-- Do you think it's a good idea to make friends with your students?
-- ______, I do. I think it's a great idea.
| A．Really | B．Obviously | C．Actually | D．Generally |
Every evening after dinner, if not ______ from work, I will spend some time walking my dog.
| A．being tired | B．tiring | C．tired | D．to be tired |