1. _____ once is better than to hear a hundred times.
2. Nobody enjoys ______.
A.being looked down upon
B.looking down upon
C.being looked down
D.to look down
3. ----- What _____ his illness? ----- I don't know. Perhaps he ate some green peaches.
4. ______ a good deed .It will bring you a lot of happiness.
5. He ____ to lend me his bike but I refused, for I didn't want to trouble him.