Canada is a country ______ many different nationalities as well as one with foreign immigrants ______ the majority of its population.
Why not ____?
The headmaster’s words are quite _____.
--Do you often hear John ___ in his room? --Yes. Listen! Now we can hear him ___ in his room.
The scientist suggested ____ the experiment in a different way.
It’s bad for your eyes ____ computer games for a long time.