Willie has complained to the sales manager about the PC he bought _______ screen exploded for no reason.
| A．which | B．where | C．when | D．whose |
Had I known about this computer program, a huge amount of time and energy .
| A．would have been saved | B．had been saved |
| C．will be saved | D．was saved |
House owners keep their gardens in a neat and orderly state according to the regulations.
| A．may | B．would | C．can | D．shall |
The traffic rule says young children under the age of four and ____ less than 40 pounds must be in a child safety seat.
| A．being weighed | B．to weigh | C．weighed | D．weighing |
some people regard as a drawback is seen as a plus by many others.
| A．Whether | B．What | C．That | D．How |
Tell me _______how it came about that you were 20 minutes late for class. You needn’t go into details.
| A．in advance | B．in brief | C．in total | D．in vain |