---What do you think of your new English teacher？--- She was well prepared for her first lesson and left us a good________.

As is well known, the brain performs a very important _______, which controls the nerve system of the body.

There is no _____ that the Chinese people will present to the world a successful, splendid  and unforgettable exposition（博览会）.

The  poor man made a_____after doing business forthree years.

 Internet is an important _____ for people to get the latest news.