How do you think _________that he was an hour late on such a short journey?
| A．it came about | B．did it come about |
| C．it was come about | D．was it come about |
It's nearly seven o'clock . Jack _____ be here at any moment .
| A．must | B．need | C．should | D．can |
If you _____ stop smoking , you can only expect to have a bad cough .
| A．won't | B．would not | C．do not | D．can not |
.—Must I turn off the gas after cooking ? --Of course . You can never be ___ careful with that.
| A．enough | B．too | C．so | D．very |
“Where is it?” “Where is _____? I don't know what do you mean?”
| A．what | B． that | C．where | D．so |
An awful accident, however, _____occur the other day.
| A．does | B．did | C．has to | D．had to |