. If only I ________ how to operate an electronic computer as you do.
| A．had known | B．would know |
| C．should know | D．knew |
Arriving at a bus stop ______ the vehicle pulling away just a few minutes ago is quite annoying.
| A．to find | B．finding | C．found | D．to be finding |
It sounds like something is wrong with the car’s engine. _______, we’d better take it to the garage immediately.
| A．Otherwise | B．If not | C．but for that | D．If so |
I have promised that my daughter _______ get a new electronic dictionary on her next birthday.
| A．should | B．must | C．shall | D．would |
Good news! The price of all those second-hand goods is ________ before.
| A．30% as lower as | B．30% lower than |
| C．lower 30% than | D．as 30% low as |
Students in English-speaking countries usually address their man teacher ‘sir”, but __________ their woman teacher “madam”.
| A．seldom they address | B．do they seldom address |
| C．seldom do they address | D．they seldom do address |