--- Seems that Jack is very rich. He is always changing his cars. What is he?--- ______, but I am not quite sure.

I believe that human cloning is wrong. If we toy with nature, we will have to deal with the _______.

 Duty is an act or a course of action that people ____ you to take by social customs, law or religion.

—I heard a bus accident happened yesterday. —The bus crashed. Luckily, only a few passengers were _____ injured in the traffic accident.    

--- ____ busy schoolwork, the children also have to take arts, music andsports classes in their free time.--- I wonder what they will become.