Tom hid himself behind the door, _________ he could hear the steps of his mother clearly.

You can’t have enjoyed your picnic in the rain last Saturday, I’m afraid.— On the contrary, we ______.

The U. S．declares ithas the best medical technology in the world，but quite alot of Americans have no __________to health care service．

The number of foreign students attending Chinese universities ______ rising steadily since 2009

He _______ his head to see the _______ sun.