——Why did Tan become interested in the sounds of nature?——__________he thinks the best music comes from nature.
Breakfast is _______ meal of the day. It gives us energy after a long night without food.
The lady in this photo _______ be over fifty! She looks so young!
--Mike, can you tell us something about our new teacher? -- Oh, sorry. I know nothing because I _____________ him before.
-- Would you please __________your radio a little? I can hardly go to sleep. -- Oh, sorry.
The boy ___________ exercises, so he has to see the doctor because of overweight.