Not ________ I stepped into Grade two did I choose to study arts.
| A．until | B．when | C．as | D．after |
—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 |
Just an hour ago he was telling me on the phone that he ________ home right after the work.
| A．comes | B．came |
| C．would come | D．will come |