It was in the lab _____ was taken charge of by Professor Zhang ______ they did the experiment .
| A．where; that | B．which; where |
| C．that; where | D．which; that |
—How did it come that you damaged your car so badly?
—I ____into a tree on the roadside the other day.
| A．ran | B．had run | C．was running | D．run |
Air pollution, together with littering, ____ many problems in our large industrial cities today.
| A．causes | B．cause | C．caused | D．causing |
His advice made me happy, but ____others angry.
| A．making | B．to make | C．/ | D．make |
____ the flight to Beijing will be delayed is ____ I’m especially worried about.
| A．If; what | B．Whether; that | C．When; that | D．Whether; what |
— We shall take the conditions into careful account ____ you have attached to this contract.
— Thanks. Hope for further cooperation.
| A．as | B．which | C．where | D．what |