Have you ever had the case _______ you can’t recognize your friend’s voice on the phone?
| A．which | B．that | C．where | D．when |
[2013·安徽卷] From space, the earth looks blue. This is ________ about seventyone percent of its surface is covered by water.
| A．why | B．how |
| C．because | D．whether |
[2013·浙江卷] The only way to succeed at the highest level is to have total belief ________ you are better than anyone else on the sports field.
| A．how | B．that | C．which | D．whether |
(2013·安徽，21)From space, the earth looks blue. This is ________ about seventyone percent of its surface is covered by water.
| A．why | B．how |
| C．because | D．whether |
________ makes the book so extraordinary is the creative imagination of the writer.
| A．That | B．What |
| C．Who | D．Which |
Do not let any failures discourage you, for you can never tell ________ close you may be to victory.
| A．how | B．that |
| C．which | D．where |