_________as one of the most important inventions of the time, the computer helps people living in different countries to do a lot of things.

European football is played in 80 countries, _________it the most popular sport in the world.

— Do you know the old man ______ on the bench over there?— He is my grandfather.

  He picked up an envelope ____50 dollars in it.

    to sunlight for too much time will do harm to your skin.