—When did the world come into        .—It is hard to say.

We are living in an age _______ many things are done on computers.

Mary wanted to ______ her experiment, but her parents encouraged her to continue.

---How do you usually spend your evening?---I usually ____. But if there’s a new film on TV, I watch it.

—Hello, this is China Eastern Airlines. What can I do for you? —I’d like to     two tickets to Beijing.