When you get on a bus, it's polite to wait for ________ turn.
It is a pity that his son was born _______ a weak heart.
-----It’s very nice of you to carry the box for me. -----__________
The colour of this book is similar to ________ of mine.
It is not wise ________ teenagers to be crazy about stars. It is more important _____ them to learn more about Chinese culture.
It is wrong of a student ______ his homework by himself. Copying makes one lazy.