30. All these gifts must be mailed immediately_________ in time for Christmas.

　 A. in order to have received　　　　　　　　　 B. in order to receive

C. so as to be received　　　　　　　　　　　 D. so as to be receiving

29.------Excuse me, sir, where is Room 301?

----- Just a minute, I’ll have Bob_______ you to your room.

A. show　　 　　　　　　　　　　　　 B. shows　　 　　　　　　　　　　 C. to show　 　　　　　　　　　　 D. showing