__________his immediate help，I gave him some reward，but he refused.
A. In return for B. Because of
C. Thanks to D. In case of
The reference book，mainly__________use in colleges，is a bestseller this year.
A. designed for B. designed to
C. designing of D. designing for
As is known to us all，China is a developing country________the third world.
A. belonging B. belonged
C. belonging to D. belonged to
________ is known to us all is that London will host the 30th Olympic Games next summer.
A. As B. Which
C. It D. What
The mother said that she would buy a gift for her daughter with the__________.
A. 20 dollars remained B. 20 dollars to remain
C. remained 20 dollars D. remaining 20 dollars
The police ________ the prisoner to see if he had a gun.
A. searched for B. searched
C. was in search of D. was in their search of
