— Who’s that boy reading in the garden? Is it David?— It ____________ be David. I saw him in the classroom just now.
Tom can play ______ football and his brother Mark can play ______ piano.
Listen! Miss Wang ________ Bob.
Mum often ________ us not to play in the street.
Don’t read ________the sun. It’s bad for your eyes.
If you are tired, you can ________ a rest.