The teacher always tells her students that only if _____ hard ____ achieve success.
| A．do they work, will they | B．do they work, they will |
| C．they work, will they | D．they work, they will |
—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 |
—Peter！Let's hurry.The boss is coming.
—Oh，I was afraid that we ________ her.
| A．miss | B．had missed |
| C．will miss | D．have missed |
The past two years ________ a sharp rise in oil price，which adds to the burden of auto transportation industry.
| A．witnessed | B．has witnessed |
| C．is witnessing | D．witnesses |
—Jack is always studying hard and does well in all subjects.
—No wonder he ________ to be admitted to Beijing University.
| A．is expecting | B．will be expected |
| C．is expected | D．will expect |