CFM56-5B发动机的低压燃油关断活门是如何作动的？（ ）

When they hear SARS, most people＇s initial _______ was fear.

Mary is so busy. She cannot spend enough time with her son________she wants to.

Since nobody gave him any help, he ________ have done the research on his own.

Hitler set out to conquer all of Europe in the belief that the Germans were the master ________

The skyscraper stands out ______ the blue sky.

It is _______ impossible to find a perfect medical project in this part of the city.

By ______ Mr. White is a bus driver.

Let us get ______ this old barn. It is of no use to us.

In some countries men usually have to _______ when they reach the age of 55.

John wrote to a pen friend in England _______ for several years.