Nowadays, most young people enjoy ______ on the Internet.
—Would you like to come up to my apartment for dinner tonight? —_____, but I’m too busy.
The news _____ the football team won the game made us happy.
Come and see me whenever _____.
He is made ______ monitor of our class.
Long ago, man used to ______ with his hands but now man is used to ______ with machines, and sometimes a robot is used to ___ instead of people.