1. It was after Tom had ______ unforgettable experience that he learnt _______ value of showing kindness to other people.
A. an; the B. an; a C. /; a D. /; the
2. Get the paper ______ to make it smaller and put it in your pocket.
A. fold B. folded C. folding D. to fold
3. It is ______ to cast your net where there is no fish.
A. in return B. in vain C. in case D. in favor
