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 |
---The window is dirty.
----I know. It ______ for weeks.
| A．hasn’t cleaned | B．didn’t clean |
| C．wasn’t cleaned | D．hasn’t been cleaned |
He used _______ on the right in China, but he soon got used ______ on the left in England.
| A．to drive, to drive | B．to drive, driving |
| C．to driving, to drive | D．to drive, to driving |
The villagers went out to the mountain __________ the missing child.
| A．in a search of | B．looking after |
| C．searched for | D．in search of |
The room _______ very useful when we had visitors.
| A．was proved | B．has been proved |
| C．has proved | D．proved |
I doubt _______ he will win or not.
| A．whether | B．if | C．that | D．when |