Before a problem can be solved, it must be obvious ______the problem itself is.
| A．what | B．that | C．which | D．why |
____ I saw her, I remembered to give Marie the money I owed her.
| A．While | B．Immediately | C．Suddenly | D．Momentarily |
―Who are those people walking along the street with banners?
―A group _______ itself the League for Global Environment Protection.
| A．calling | B．called | C．being called | D．is called |
_____ human beings live in great numbers, the waters are very likely to become contaminated.
| A．That | B．Where | C．Even if | D．Though |
_____ I admit that the problems are difficult , I don’t agree that they cannot be solved.
| A．While | B．Suppose | C．Because | D．as though |
It was found that although the girl could perceive things with her fingers, this ability ceased _____ her hands were wet.
| A．the moment when | B．the moment | C．in that moment | D．before |