32．Many experiments_____before the research team was able to get the exact data to carry on project.
| A．have done | B．had been doing | C．had been done | D．have been done |
Once made out, the plan must be carried out ______ any difficulty.
| A．regardless of | B．instead of | C．because of | D．in need of |
—Can I pay the bill by check?
—Sorry, sir. But in our hotel payment ______ be made in cash.
| A．need | B．shall | C．will | D．can |
We are very proud of ______ you have accomplished so far. You should be proud too.
| A．what | B．that | C．which | D．where |
—Do you ______ the idea of living a low-carbon life?
—It sounds tough, but it is a tendency.
| A．correspond to | B．apply to | C．cater to | D．subscribe to |
The public transportation in this city is very convenient, where many buses run ______.
| A．occasionally | B．approximately | C．immediately | D．frequently |