--- Did you find the missing couple in the mountain yesterday?
--- No, but we _______ to get in touch with them ever since.
| A．have tried | B．had tried |
| C．have been trying | D．had been trying |
By playing with the native boys and girls，one can ________ a lot of their language.
| A．pick up | B．set up |
| C．build up | D．put up |
—If we take a plane，we’ll of course have arrived in London by the next weekend.
—Don’t be too sure.We should ________ the weather factor.What shall we do if it is foggy?
| A．look for | B．allow for |
| C．prepare for | D．use for |
No one could ________ the failure of the experiment as everything went smoothly at first.
| A．give an account for |
| B．account for |
| C．take account of |
| D．take into account |
—How much did the guy ________ you to fix your 3G mobile phone?
—I don’t remember，but it was quite a lot.
| A．cost | B．spend |
| C．charge | D．take |
The government has agreed to pay the firms extra sums to ________ for their financial losses.
| A．make up | B．bring up |
| C．fill up | D．look up |