Only if you put ______ sun there did the movements of the other planets in ______ sky make sense.
| A．the; 不填 | B．the; the | C．不填; the | D．a; the |
Scientists study ________ human brains work to make computers.
| A．when | B．how | C．that | D．whether |
We promise ________ attends the party a chance to have a photo taken with the movie star.
| A．who | B．whom | C．whoever | D．whomever |
The newcomer went to the library the other day and searched for ________ he could find about Mark Twain.
| A．wherever | B．however |
| C．whatever | D．whichever |
His writing is so confusing that it's difficult to make out ________ it is he is trying to express.(2011·安徽)
| A．that | B．how | C．who | D．what |
The shocking news made me realize ________ terrible problems we would face.(2011·北京)
| A．what | B．how | C．that | D．why |