Everyone knows that _______ is dangerous to play with fire, but _______ is difficult is to prevent children from playing with fire.

Why don’t you bring ______ to his attention that you are too ill to go on working?

All the books written by Dickens are available in our library. You may borrow ___ you love.

Some people would rather ride bicycles as bicycle riding has _____ of the trouble of taking buses.

—Is there any mail?
—No, ______ at all．

The old man would appreciate _____ if you could do him that favour.

–What would you like to eat here?
-- ____ but spaghetti, which is not to my taste.

Many people have been ill from a strange disease these days, _____ we’ve never heard of before.

Tom’s mother kept telling him that he should work harder, but ______ didn’t help.

The boy became fatter and fatter each day and_____ made his parents sad.