The doctor must be _______ 24 hours a day, 7 days a week in the boarding school.

.Mr Harris apologized ______ the children ______ the lady ______ what they had done.

If a television or radio breaks the new rules, it is forbidden to screen advertisements and the officials ______ face serious punishment.

Lily got up at 6 o’clock　　　　，but she realized it was Sunday as soon as she prepared her school bag.

Sam always pronounces my name wrong.  Do you think he does it ______ ? 

The Great Wall winds its way from west to east, _______ deserts, _______mountains and ________valleys, until at last it reaches the sea.

______ the fact that the old cars could not go as fast as modern ones, people still watched the race with a great deal of pleasure and excitement.

The company has launched several types of cars this year, and one_______ appeals to the young.

Most of the people attending the meeting are not _______ the project, for it costs too much.

__________the guidance of my teacher,1 won the first prize in the English Speech Contest.