－How was your trip to the Maldives?
－I’ve never had one before.
| A．a pleasant | B．a more pleasant | C．a most pleasant | D．the most pleasant |
See the model ship ____in the pool? That’s what my father made for me last weekend.
| A．float | B．floating | C．floated | D．to float |
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 |