It __________ Tom that parked the car here, as he is the only one with a car.
| A．may be | B．might have been | C．must have been | D．could be |
Mum _____ to us, “Be quiet! Your sister is sleeping.”
| A．whispered | B．shouted | C．explained | D．replied |
.Don’t take too much of the medicine; it does you more harm than good if you ____.
| A．do | B．take | C．like | D．have |
There aren’t many seats left for the concert; you had better make sure ____ two today.
| A．getting | B．to have got | C．that you get | D．that you will get |
Examination compositions, together with most business letters and government reports, are the main situations ____ formal language is used.
| A．in which | B．on which | C．of which | D．for which |
If you don’t keep the meat in the refrigerator on such a hot day, it may ____.
| A．go out | B．go away | C．go off | D．go down |