. Whether ways will be found to stop pollution or not is just ______ worries the public.
| A．which | B．that | C．what | D．where |
________ your composition carefully, some spelling mistakes can be avoided.
| A．Having checked | B．Check | C．If you check | D．To check |
It remains doubtful whether the project _____________ next month will bring profits to the company.
| A．accomplished | B．to be accomplished |
| C．having accomplished | D．being accomplished |
It is ___________ the customers’ needs that has made chain stores so popular in big cities in China.
| A．meeting | B．met |
| C．to have met | D．being met |
The young man insisted that he _________ nothing wrong and __________ free.
| A．did, set | B．had done, must be set |
| C．do, be set | D．had done, should be set |
When first __________ to the market, the computer software was not a success due to its complexity in operation.
| A．introducing | B．being introduced |
| C．introduced | D．to be introduced |