49. You must go there at once because the situation prompt action.
| A．calls for | B．calls back | C．calls at | D．calls on |
________ seems to be a strong competition in China for senior high students to enter universities does exist in other countries as well.
| A．It | B．Which | C．What | D．That |
Before the problem can be solved，it must be obvious ________ the problem itself is.(2011·湖南，31)
| A．what | B．that | C．which | D．why |
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 |