. --Did you see ________ may be the longest total solar eclipse （日全食）in 500 years yesterday?
--No, it was cloudy above my city at that time.
| A．what | B．that | C．who | D．all |
Jack was in low spirits those days and his friends did all they could _____ him up.
| A．cheer | B．cheering | C．cheered | D．to cheer |
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 |