Being engaged in the research work, Dr. Yang seldom goes anywhere__________ his office.

Have you ______ them of the final decision of the board?

Grace advised us to withdraw ________.

Gain at the expense of reputation should be called _______.

Fresh fruits and vegetables are generally less expensive when they are in _______.

Frequently single-parent children ____some of the functions that the absent adult in the house would have served.

For most people, it takes _______ effort to memorize a long poem.

Football is _________ the most popular sport of the world.

Food and ________ are very important to us all.

Every possible test ______ to decide the nature of her illness.

Eventually最后, they gave up the project to build a bridge over the river because of the _______ high costs it would involve.