5. He was going to attend a party, so he changed ______ a suit. That is to say, he changed his jacket ____a suit.

 A. into, for       B. for, into       C. to, with        D. from, for                                                                                   

为什麽选a?

9. Please make sure the lights will _______ if no one is in the room.

A. go out            B. turn off             C. put out              D. take away

为什麽不选b而选a?