--Why are your eyes so red? You ________ well last night.
--Yes, I stayed up late writing a report.
| A．mustn’t have slept | B．can’t have slept |
| C．couldn’t sleep | D．might not sleep |
The ship was _____ in a storm off Jamaica.
| A．drowned | B．sunk | C．wrecked | D．submitted |
Our research has focused on a drug which is so _____ as to be able to change brain chemistry.
| A．powerful | B．influential | C．monstrous | D．vigorous |
The boy slipped out of the room and headed for the swimming pool without his parents’ _____.
| A．command | B．conviction | C．consent | D．compromise |
We won't know whether it will be successful. We won't know whether there will be good _____.
| A．ends | B．results | C．effects | D．causes |
The government placed _____ on the numbers of foreign cars that could be imported.
| A．limitations | B．restraint |
| C．requirements | D．restrictions |