Standing on the platform, Professor Li kept silent for a moment, on the audience below.
| A．her eyes fixed | B．and her eyes fixed |
| C．and her eyes fixing | D．her eyes fixing |
Though I was tired out that evening, I _____ from falling asleep by the great pain in my knee.
| A．was prevented | B．had prevented | C．has prevented | D．am prevented |
Simon was _____ why many of his friends didn’t turn up at his birthday party.
| A．limited | B．crashed | C．spotted | D．puzzled |
Without gravity, we _____ walk on the ground as freely as we do now.
| A．couldn’t | B．mustn’t | C．shan’t | D．needn’t |
Zhang Heng, one of _____ best-known Chinese astronomers, showed a strong interest in _____ astronomy as a child.
| A．the; the | B．the; 不填 | C．不填; the | D．不填; 不填 |
— Could I have another cup of coffee, Daddy?
—_____ It will be hard for you to go to sleep tonight if you do.
| A．Better not. | B．Why not? | C．What for? | D．As you wish. |