It is obvious to the students ______ they should get well prepared for their future.
| A．as | B．which | C．whether | D．that |
As is recorded in history, silkworms（蚕）were first raised by a woman in _________ is today Hebei Province．
| A．where | B．the place | C．which | D．what |
Does it make any difference __________ he refuses or accepts the invitation?
| A．whether | B．which | C．if | D．that |
You have not yet answered my question _______ I can join in the party tonight．
| A．whether | B．if | C．which | D．that |
Regulations require__________needs special diets the cooking manager in advance.
| A．who; informs | B．whom; informed | C．whomever; inform | D．whoever; inform |
I'd like to work with ______ is honest and easy to get on with．
| A．who | B．whoever | C．whomever | D．no matter who |