— I need to advertise for a roommate for next term. —______? Mary is interested.
| A．What for | B．Why not | C．So what | D．Why bother |
She _______ his number in the phone book to make sure that she had got it right.
| A．looked up | B．picked out |
| C．looked for | D．made out |
Teachers have to constantly update their knowledge in order to maintain their professional __________.
| A．consequence | B．independence |
| C．competence | D．intelligence |
I don’t like fish, so I ________ eat it unless I was extremely hungry.
| A．needn’t | B．shouldn’t |
| C．can’t | D．wouldn’t |
I have no idea ____________ measures the government will take to stop the river from being further polluted.
| A．which | B．what | C．that | D．whose |
Scientists are convinced __________ the positive effect of laughter _________ physical and mental health.
| A．of; at | B．by; in |
| C．of; on | D．on; at |