What impresses me most is________he appears in front of others，he wears a sincere and charming smile.
| A．what | B．which |
| C．that where | D．that whenever |
His writing is so confusing that it's difficult to make out ________ it is he is trying to express.(2011·安徽，33)
| A．that | B．how | C．who | D．what |
It is by no means clear ________ the president can do to end the strike.(2012·新课标全国)
| A．how | B．which | C．that | D．what |
________you said at the meeting describes a bright future for the company.
| A．When | B．How | C．What | D．That |
From space, the earth looks blue.This is ________about seventy－one percent of its surface is covered by water.
| A．why | B．how | C．because | D．whether |
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 |