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

A great number of students ______ said they were forced to practise the piano.    

It is worthwhile considering what makes “convenience” foods so popular, and____ better ones of your own.

__________ to sun, rain and wind for a long time, the stone split.

Mr. Green stood up in defence of the 16-year old boy，_________ that he was not the one ____________.

On July 20, 1969, Neil Armstrong become the first man _________foot on the moon .

John rushed out in a hurry，                the door                   .

With a lot of difficulties ___ , they went to the seashore and had a good rest.

Generally speaking, when___ according to the directions, the medicine has no side effect.

_______ in her skirt, the little girl tried to make herself ________ at the party.