swim in a river or lake, be sure to investigate is below the water surface. Often there are rocks or branched hidden in the water.

They talked for about an hour of things andpersons _____ they remembered in the school.

Hello! Jim speaking. Who’s _____________ Hello. This is Millie.

Is it John that is being scolded in the manager’s office?No. It ______ be him. I saw him on the way just now.

Look at the clock! It’s time ______ work.