It is thought that one billion people in the world,_____ is half the world’s workers, earn their living by farming.

_________ is known to all，good friends _________ happiness and value to life.

Walking through the park, _____.

What do you think of the TV show? —_____ my opinion, it was wonderful. [ ]

There isn’t_____airport near where I live. _____ nearest one is 110 kilometers away.