.Whenever you enter the reading room, you can find all the students _____ at their desks, with their attention _____ on the books, except Tom. 

 She soon _________ French when she went to live in France.

Many people think any government's work should be evaluated ______ on citizens' happiness level．

     a written permission, he had to write another letter to the president of the university.

—Can you tell us what is important to a businessman? — ________ information.