Susan came to the party yesterday, but it was already half past eight ______she turned up.
| A．that | B．before |
| C．until | D．when |
—The research on the new bird flu virus vaccine is challenging and demanding. Who do you think can do the job?
—____ my students have a try?
| A．Shall | B．Must | C．Will | D．May |
He is only too ready to help others, seldom, ____, refusing them when they turn to him.
| A．if never | B．if ever | C．if not | D．if any |
—Look, it ____ again.
—Yeah. This is the third snow we ____ this spring.
| A．will snow; are having | B．has snowed; had had |
| C．is snowing; have had | D．snows; have had |
All attentionon the beautiful girl, the boy didn’t notice the teacher enter the classroom.
| A．focusing | B．focused | C．to focus | D．was focused |
Constant practice has erased my accent to a pointmany people think I’m a native speaker.
| A．which | B．what | C．where | D．when |