----That kind of computer is far too expensive.
----- I’ll buy one, ______ .
| A．though | B．so | C．either | D．too |
He is believed____________ in at his office on his way home.
| A．dropping | B．to have dropped |
| C．having dropped | D．to be dropped |
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 |
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 |