—What made her unhappy?
—_____.
| A．Because she lost her wallet | B．she lost her wallet |
| C．Losing her wallet | D．To lose her wallet |
I am determined to get a ticket for the concert ____ it means standing in a line all night.
| A．as though | B．even if | C．as if | D．so that |
It was because of the bad weather _________ the football match had to be put off.
| A．so | B．so that | C．why | D．that |
Professor Lee failed many times but he ________found a good way to solve the problem.
| A．gradually | B．entirely | C．finally | D．frequently |
Ladies and gentlemen, please fasten your seat belts. The plane________.
| A．takes off | B．is taking off | C．has taken off | D．took off |
The lady insisted that the young man ____her wallet and____to the police station at once.
| A．had stolen; be sent | B．should steal; sent |
| C．has stolen; sending | D．steal; had been sent |