Harrison Ford is thought to be one of the few movie stars ______ as a carpenter before．
| A．to work | B．to be working |
| C．to have worked | D．to have been working |
Principal White has been working in the school for about 20 years, ____all his energy to teaching and researching as well as the running of a healthy school.
| A．devoted | B．devoting | C．to devote | D．devote |
The engineers are so busy that they have zero time for outdoor sports activities,___they have the interest.
| A．wherever | B．whenever | C．even if | D．as if |
---What do you think of his talk on Information Technology?
---Oh, excellent. It's worth ________．
| A．listening to | B．being listened to | C．listening of | D．to be listened to |
There is little doubt in your mind that he is innocent, ________？
| A．is there | B．isn' t there | C．is he | D．isn' t he |
Although the Eiffel Tower ________ to last for 20 years, it is still standing today.
| A．has designed | B．had designed | C．is designed | D．was designed |