Historically, _______ main material for making tables has been wood, but ______ metal and stone have also been used.
| A．the; / | B．/; / | C．the; the | D．/; the |
I need one more stamp before my collection __________.
| A．has completed | B．completes |
| C．has been completed | D．is completed |
The house could fall down soon if no one __________ some quick repairs work.
| A．has done | B．is done | C．does | D．had done |
__________ small, the company has about 1，000 buyers in over 30 countries.
| A．As |
| B．If |
| C．Although |
| D．Once |
It's said that the power plant is now __________ large as what it was.
| A．twice as |
| B．as twice |
| C．twice much |
| D．much twice |
If parents have children help with housework, the children will feel needed. __________，they will learn to take care of themselves.
| A．On the contrary |
| B．in a word |
| C．That is to say |
| D．What's more |