—Are you going out? It’s windy and cold outside.—I know, but it’s the last day to buy tickets to the basketball final, ______ I must go.
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_________ .
I still remember the first park_________ I visited in my life.