1 . There are so many bikes in the shop that I really don't know which one ________ (choose)．

2 . Rather than sit here waiting, I prefer ________ (go) to find out what on earth has happened.

3 . The money collected should be made full _____of ______ the people who suffered a lot in the earthquake.

A．use; to help	B．using; helping
C．to use; to help	D．use; helping