There _______ less air pollution in the country .

What did you do last Sunday? — I.

I hope there _______ less pressure on us today.— If so, we _______ enjoy a more pleasant life.

This is 3-D printer. And this is an artificial (人工的) ear. Can you believe that scientists printed this artificial ear by this 3-D printer?

Do you know ______ boy in blue ? —Yes , he is ______ English boy .