You ______ to the meeting this afternoon if you have something important to do.

—Do you think the rain will affect the football match?—The players are used to such rainy weather, so it ______ make any difference to them.

–Someone is knocking at the door. Who ______ it be? --It         be Victor. He has gone to London yesterday.

——Who’s that man? Is he Mr. Brown?——That    be Mr. Brown. He never walks this way.

 Don't use water to put out the fire if oil catches fire. As is known, oil ________ float on water.