---Haven’t you heard of a person called Zhang Cunhao?---______. He is a famous scientist and won the 2013 Top Science and Technology Award.
Tom has to leave now _________ he can catch the train.
Life is always filled ____ sadness and happiness.
— Would you like tea or water? — _________ is OK. I really don't mind.
Alice in Wonderland is a fantastic movie. It's about _________.
China is developing _________ of all the countries in the world.