Mr. Smith is _______ a teacher.  He is a friend as well.  We all respect him.

Due to the policy of free highway fees on major holidays, too many passenger cars are trapped on the highways, causing heavy traffic jams, some even _______ for several hours.

Some parents are just too protective. They want to ______ their kids from every kind of danger, real or imagined.

.Ten minutes later，a bus ______ and everybody got on it.

The expert says that nowadays there are too many problems linked to poor diet and a ________of exercise.