—She is angry with me, isn’t she? ---______.
He is only too ready to help others, seldom, ________, refusing them when they turn to him.
A recent study has found that the number of smokers ________ sharply over the past five years.
How close parents are to their children ________ a strong influence on the development of the children's characters.
—Was it at 11 o'clock ________ your father came back last night?—Yes, he is always coming back so late.
Scientists are still wondering ________ the Egyptians built the pyramids so long ago.