"Take a look at these pictures, and see if you can _____ the criminal． " The policeman said to the witness．
| A．pick up | B．pick off | C．pick out | D．pick at |
—Mary，turn the heat down，________ burn.
—OK.Mum.
| A．the cake will | B．or the cake will |
| C．will the cake | D．and the cake will |
Seldom ________ TV when he studied in senior high school.
| A．he watches | B．he watched |
| C．does he watch | D．did he watch |
Everything，unless otherwise ________，will go on as planned.
| A．stating D | B．states | C．to state | D．stated |
—It's a pity that Andrew didn't want to go to the conference.
—________ willing to go，we could have paid all his expenses.
| A．Had he been | B．Being |
| C．Was he | D．He had been |
—Why do you look so puzzled?
—Oh，I ________ over a most difficult maths problem.
| A．thought | B．have thought |
| C．am thinking | D．think |