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 |
Mary clapped her hand over her mouth _______ she realized what she had said.
| A．while | B．as soon as |
| C．suddenly | D．then |
____ she goes, there are crowds of people waiting to see her.
| A．Wherever | B．However |
| C．Whichever | D．Whoever |
You should put on the notices ______ all the people may see them.
| A．where | B．in which |
| C．at | D．for them |
_____ I suggest, he always disagrees.
| A．However | B．Whatever |
| C．Whichever | D．Whoever |
“Was his father very strict with him when he was at school?” “Yes. He had never praised him _______ he became one of the top students in his grade.”
| A．after | B．unless |
| C．until | D．When |