——This wall of air is an effective answer to the problem and it ____ work.
——But it is a question to put such a wall of air around the statue.
| A．may | B．must | C．should | D．could |
The sunlight came in____________ the windows in the roof and lit up the whole room.
| A．through | B．across | C．by hour | D．each hour |
The harder you work,____________.
| A．the greater progress you'll make |
| B．the greater you'll make progress |
| C．you'll make the greater progress |
| D．you'll make greater progress |
--Do you like the material?
--Yes, it ___________ very soft.
| A．is feeling | B．felt | C．feels | D．is felt |
--Where is Xiao Wang?
--I don’t know. He__________ be in the library.
| A．can | B．must | C．might | D．may |
Bread and butter____________ for breakfast in many Chinese homes nowadays.
| A．serve | B．servers | C．is served | D．are served |