_____ three influenza type A virus subtypes（子类型） have been found in pigs．
| A．By far | B．As far as | C．So far | D．Till far |
of the land in that district covered with trees and grass.
| A．Two fifth；is | B．Two fifth；are |
| C．Two fifths；is | D．Two fifths；are |
Progress so far has been very good.______，we are sure that the project will be completed on time.
| A．However | B．Otherwise | C．Therefore | D．Besides |
The water froze inside the pipe，causing it to ________and burst.
| A．expand | B．export | C．reduce | D．behave |
New ________ show that the economy of our country is continuing to grow.
| A．welfares | B．Nationalities |
| C．statistics | D．schedules |
—Would you rather_______ there tomorrow?
—No. I’d rather he________ there instead of me.
| A．to go；will go | B．go；went |
| C．go；will go | D．going；shall go |