There is a teacher’s desk ______ of the classroom. Mr. Liu is standing ______ of it.

You look really tired. —I didn’t sleep well last night. I had a headache.

The moon shines with light. What a good night!

What’re you doing, Jack—I’m looking for some information about famous people ______ I need to make a poster.

Flight331 _____I’dbetter be on my wayGoodbye—ByeHappy landing!