The little boy was watching a late night film at home ________, right in the middle of a thrilling scene, the television went blank.
| A．which | B．when | C．where | D．that |
A (n) __________ of scientists are looking into the matter and have realized a certain __________ of time is to be spent.
| A．number; amount | B．number; amounts |
| C．amount; amount | D．amount; number |
Your face seems __________. I haven't met you here in the old days.
| A．unfamiliar | B．unknown |
| C．unsimilar | D．alike |
Can you __________ behind after the others have gone and help me clear up?
| A．stay | B．fall | C．remain | D．turn |
Duncan, __________ NBA star, is one of __________ few basketball players who are very popular with Chinese fans.
| A．an; the | B．an; a |
| C．the; the | D．the; a |
The number of students in our school __________ about 30, 000 and __________ them study hard.
| A．is; a large amount of |
| B．are; a number of |
| C．are; large amounts of |
| D．is; a large number of |