—I wonder why Susan looks worried today.
—I’m not sure, but she _____a small accident driving here.
| A．could have | B．might have | C．might have had | D．must have had |
I suppose we’ll have to, bad weather conditions, spend more than 500 days undertaking the construction.
| A．considering | B．allowed for | C．including | D．linked with |
Is this TV set___ you wish to have___?
| A．the one; repaired | B．which; it repaired | C．the one; it repaired | D．which; repaired |
It is often recommended that children ________chances to get close to nature.
| A．are offered | B．be offered | C．should offer | D．must be offered |
The flu is believed____ by viruses that like to reproduce in the cells inside the human nose and throat.
| A．causing | B．being caused | C． to have caused | D．to be caused |
John was ________to learn the newshe was rejected by the committee.
| A．cast down; that | B．cast off; whether | C．cast about; that | D．cast away; whether |