Few weight-loss pills can help to keep people slim, _______?

The man in a black suit _______ be our youth worker.— I’m sure it _______ be him. I saw him in the laboratory building some minutes ago.

What happened to Jackson?—He________because of his drink-driving.

You should be _______ careful when you take the chemistry exam.—I agree. In this way, I will make _______ mistakes.

To be well-informed , we should be ______ communication _____ each other about what happens to us.