Whoever leaves the room last must ______ that all the lights are turned off.
| A．is sure | B．make sure | C．find out | D．look out |
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 |