A salty diet may increase the risk of stomach cancer ________ 10 percent, South Korean researchers found in a study of more than 2 million people．
A．at B．to C．by D．for
The first textbooks ______ for teaching English as a foreign language came out in the 16th century.
A. to be written B. written C. being written D. having written
Some people are worrying about the possibility ________ mobile phones could be responsible for a range of illnesses, from rashes(皮疹) to brain tumors．
A．that B．why C．how D．whether
— Would you mind my coming over and having a look at your new garden? My little son’s curious about those roses you grow．
—________．You are welcome．
A．Yes, I do B．Never mind C．Yes, please D．Not at all
It is the _________ in Britain that young people often do not shake hands when they meet someone for the first time.
A. custom B. habit C. hobby D. favour
Rose found her toy bear _______ under the chair.
A. hiding B. to hide C. having hidden D. hidden
