Harry Potter is an____book for children, but my cousin doesn’t seem at all_____in it.

Why do you often take exercise? — _____ me keep fit.

What do the police think about the murder?— I’m not sure. But I want anyone who ______ the clue to contact the police actively.

Is that man Mr Hu?—That ______ be Mr Hu. Because he has gone to Japan with his wife.

Don’t be nervous. There is ___________.