Look at the boy running on the playground. Is it David? —- It ______ be him. I saw him go to the teachers’ office just now.

Things made by hand are usually more expensive than _________ produced in factories.

Tommy，can you ________ these words with the pictures?一Sorry，I can’t．

It’s not __ good idea to drive for four hours without _ break.

Sandy sits between ______ and ______ .