The idea for the new machine came to Mr. Baker ______ to his invention recently.
| A．while devoting | B．while devoted |
| C．while he was devoted | D．while devoting himself. |
Jack has three sons, and both of _______ are studying in China.
| A．them | B．that | C．whom | D．who |
--- What is the price of petrol these days?
--- Oh, it _______ sharply since last month.
| A．is raised | B．has risen | C．has raised | D．is increased |
The old lady was so pleased with all _______ we had done for her _______ she wrote us a thank-you letter.
| A．what; that | B．that; that | C．which; that | D．that; what |
--- What do you think of the movie Avatar？
--- Interesting. It is _______ again.
| A．worth watching | B．worth to watch | C．worthy watching | D．worthy to watch |
She has little chance of getting the job, for _______ people have applied for it.
| A．a great many of | B．a great deal of | C．a large number of | D．a large amount of |