__________ to sun, rain and wind for a long time, the stone split.
| A．Being exposed | B．Having exposed | C．Exposed | D．To expose |
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 |
It’s certainly been a long time _________ we met last time.
| A．that | B．before | C．until | D．since |
Unfortunately, the element Madam Curie devoted all her life her death.
| A．to caused | B．causing | C．to be caused | D．to causing |