In order to make students have a good knowledge of science subjects, they are encouraged to______ their own science experiments.
| A．operate | B．direct | C．manage | D．conduct |
—You were brave enough to raise objection at the meeting.
—Well, now I regret _______ that.
| A．to do |
| B．to be doing |
| C．to have done |
| D．having done |
The first textbooks _______ for teaching English as a foreign language came out in the 16th century.
| A．having written |
| B．to be written |
| C．being written |
| D．written |
He sent me an e-mail, ________ to get further information.
| A．hoped |
| B．hoping |
| C．to hope |
| D．hope |
Sandy could do nothing but ________ to his teacher that he was wrong.
| A．admit |
| B．admitted |
| C．admitting |
| D．to admit |
More and more people are signing up for Yoga classes nowadays, ____ advantage of the health and relaxation benefits.
| A．taking |
| B．taken |
| C．having taken |
| D．having been taken |