A serious study of physics is impossible________some knowledge of mathematics.
| A．against | B．before | C．beyond | D．without |
We are at your service. Don’t to turn to us if you have any further problems.
| A．beg | B．hesitate | C．desire | D．seek |
A warm thought suddenly came to me __________ I might use the pocket money to buy some flowers for my mother’s birthday.
| A．if | B．when | C．that | D．which |
All living organisms (有机物), __________ their unique identity, have biological, chemical and physical characteristics in common.
| A．as a consequence of | B．for the sake of | C．in terms of | D．regardless of |
I have no idea when the bus will arrive. I for at least half an hour in such cold weather.
| A．had waited | B．have waited | C．will wait | D．have been waiting |
John has got a fever these days, and he says he doesn’t want to see a doctor, but I’m afraid he has no .
| A．alternative | B．extra | C．treatment | D．possibility |