The traffic rule says young children under the age of four and __ less than 40 pounds must be in a child safety seat.

The experiment shows that proper amounts of exercise, if  __  regularly, can improve our health.

_______ out from his company, he had to find a new job.

With the land prices ________, I can’t afford a piece of land big enough to park my car on.

______on ten years of observation and study, Professor Wang announces that everyone dreams every night, whether they realize it or not.

His parents meant him_____________ scientific research, but he showed no interest and turned poet.

_____________to somebody，a British person often shakes hands with the stranger.

We’re leaving at six o’clock ,and hope_________ most of the journey by lunch time.

I really don’t know ____ .

We all think it most foolish ______ this mistake.