John once worked in a remote mountain village school, which is ____only on foot.

Large earthquakes __________ the ocean can create a series of huge, destructive waves called tsunamis that flood coasts for many miles

His mother’s is his aunt.

They stopped at Tianjing_____they mightvisit the TV tower.

Where can I stay at noon, Sir?—-It depends. You can stay ____in the classroom __in the dormitory.