.______ I admit that there are still some problems about the traffic in this area, I don’t mean that it can’t be solved.
| A．While | B．Until | C．Unless | D．As |
One-third of the country____ covered with trees and the majority of the citizens______ black people.
| A．is ; are | B．is ; is | C．are ; are | D．are ; is |
Having a trip abroad is certainly good for the old couple, but it remains____ whether they will enjoy it.
| A．to see | B．to be seen | C．seeing | D．seen |
Mencius believed that the reason why man is different from animals is______Man is good.
| A．that | B．what | C．why | D．whether |
_____ with so much trouble, we failed to complete the task on time
| A．To face | B．Faced | C．Face | D．facing |
It’s reported that the United States uses______ energy as the whole of Europe.
| A．as twice | B．twice much |
| C．twice much as | D．twice as much |