A. It was why that; what B. Is it why that; as

C. Why is it that; as D. Why it is that; that

6) There is nothing more I can try ______ you to stay, so I wish you good luck.

A. being persuaded B. persuading

C. to be persuaded D. to persuade

7). When asked why he went there, he said he was sent there for a space flight.

A. training B. being trained

C. to have trained D. to be trained

8). the safety of gas, the government has checked the city's gas supply system thoroughly.

A. To ensure B. Ensuring

C. Having ensured D. To have ensured

9). The children talked so loudly at dinner table that I had to struggle ______.

A. to be heard B. to have heard

C. hearing D. being heard

10). The crowd cheered wildly at the sight of Liu Xiang, who was reported ______ the world record in the 110-meter hurdle race.

A. breaking B. having broken

C. to have broken D. break

11). -The last one ____ pays the meal.

-Agreed!

A. arrived B. arrives

C. to arrive D. arriving