How ____you are coughing! —–Yes, I have had a ________cough since last week.

Are they ______books? –No, they aren’t. They’re ______ books.

How about the pollution in the countryside?－Luckily, it’s not as serious as _______ in the big cities.

What were you doing this time yesterday? — I ______ on the grass and drawing a picture.

Everyone is here______Lei,he is ill in hospital. []