Some people believe _______ has happened before or is happening now will repeat itself in the future.

Someone’s been here. Who ___ it be? It looks like Helen.—It ___ be Helen.She is ill in hospital.

Please take it _________, I’m not telling a joke.

23. Don’t bother your father tonight —— he’s got a lot ____ his mind.

I walked in our garden, ______ Tom and Jim were tying a big sign onto one of the trees.