Whenever I go to Beijing, ____ is quite frequent, I will go to visit the Great Wall.

Each year __________ fishes are killed by the polluted water and many people are made sick by the polluted air .—-So we should do something to stop it .

Would you mind ______ here?

Everyone except Bill and Jim ______there when the meeting began.

This is the first time that we ____________a film in the newly-built cinema together.