— I have trouble ______ my new computer.— Don’t worry. I will show you ______.
You’d better stay at home. It’s raining_________ .
People should _________ down trees in order to protect the environment.
He has read_________ many books _________ he knows a lot about the world.
John with his parents _________ been in Australia for about two years.
I’m afraid that no one knows_________ .