A study shows that walking fast in your old age is a ______ that you will live a long life.
| A．sign | B．mark | C．symbol | D．signal |
The 2010 world Expo will__________ in Shanghai.
| A．take up | B．take on | C．take place | D．take off |
E-schopping.when properly ___________.can save us a lot of time and money.
| A．doing | B．to do | C．having done | D．done |
______ the danger from enemy action, people had to deal with a severe shortage of food, clothing, fuel, and almost everything.
| A．As soon as | B．As long as | C．As far as | D．As well as |
The professor gave orders to the students that the rest ______ before 5:30.
| A．be finished | B．will be finished | C．will finish | D．finish |
I can hardly ______ very loud noise while I am studying.
| A．put up with | B．get rid of | C．have efforts on | D．keep away from |