Not until the early years of the 19th century ________ what heat was.
| A．man did know | B．did man knew |
| C．didn't man know | D．did man know |
It’s a bad practice to ____ children much money as a New Year gift.
| A．promise | B．permit | C．admit | D．allow |
____ the help of experienced career instructors, this type of job-hunting training ____ to be very efficient.
| A．By; has proved | B．With; has proved | C．Under; is proving | D．With; is proved |
——Not getting that job was a big let-down.
——Don’t worry. Something better will ____.
| A．come along | B．take on | C．go by | D．fall behind |
I spent the whole day repairing the motorbike. The work was ____ simple.
| A．nothing but | B．anything but | C．something of | D．all except |
——Did your classmate accept your invitation?
——No, he ____ refused.
| A．as far as | B．as well as | C．as soon as | D．as good as |