The engineers made two big plans for the dam, ____ was never put in force.
| A．one of them | B．which |
| C．one of which | D．every one of which |
--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 |
Is this the restaurant ___________ ?
| A．which you work | B．in which you work |
| C．for which you work | D．where you work in |
—Will you go fishing with me?
—___________．
| A．No, I'll be very busy | B．Yes, I'll be glad |
| C．Certainly, I'll be sorry | D．Certainly, I'll be glad to |