31．The man stopped his bicycle beside the car______it had a broken chain．
| A．or | B．until | C．as | D．Yet |
The haze or smog was so serious that the winter running _________.Some students complained as they ran
| A．could have cancelled | B．should have cancelled |
| C．must have been cancelled | D．ought to have been cancelled |
—What about __________ lecture yesterday?
—Well，__________ most boring one indeed.
| A．／；the | B．the；a | C．the; the | D．／；a |
I think the biggest problem in banning smoking is ______ people can buy cigarettes easily.
| A．that | B．whether | C．where | D．how |
— Have you told your parents about your decision?
— Not yet. I can hardly imagine ______ they will react.
| A．what | B．that | C．how | D．when |
—Did you sleep well last night?
— No, the loud noise from the street ______ me awake for hours.
| A．had kept | B．is keeping | C．has kept | D．kept |