–Is this your pen? —No, it isn’t. It’s     pen.

－Tom, who taught          Chinese before you came to China?－Nobody. I learned it by        .

The room was dark，_________ I turned on the lights．

－Can I use your bike this afternoon?_______ is under repair.－No problem. Here’s the key.

–______ is your art Lesson? – It’s at 8:20 today.