—How long do you suppose it is he arrived here?
—No more than half a week.
| A．since | B．before | C．that | D．when |
The boss____________ the worker how to do it, or the accident couldn't have happened.
| A．can't have told | B．ought to tell |
| C．could have told | D．mustn't have told |
She liked the dictionary so much that she would like to take it ____________ it cost.
| A．why | B．how much | C．whatever | D．how expensive |
Don't be joking. It's time to____________ your business.
| A．set out | B．take up | C．go on | D．get down |
It may not rain, but you had better take an umbrella__________.
| A．in case | B．as well | C．as least | D．in need |
I'd like to be a professional singer, but I don't think I've got
| A．a good voice enough | B．a good enough voice |
| C．a voice enough good | D．an enough good voice |