My advisor encouraged _____ a summer course to improve my writing skills.

—How did she get infected?
—She _______ the viruses without any protection．

The number of speech pathologists(who help people who have problems speaking)      double by the year 2012.

In English, if new words continue to be used for at least five years they generally ________ the Oxford English Dictionary.

No one likes to talk to him because he is difficult to _______.

In the Olympic Games, only athletes who have reached the agreed standard for their ____ will be allowed as competitors.

While studying, fix your mind on what is really important, or you will _____ remembering nothing.

The more one is_______ the English-speaking environment, the better he or she will learn the language.

--- You are always full of _____. Can you tell me the secret?
--- Taking plenty of exercise every day.

My teacher is very nice. I’ll never forget the ______he has done for me.