The air pollution of the city ____ by 20 percent thanks to the strict measures taken by the government.
| A．has been fallen down | B．has been increased |
| C．has been reduced | D．has been risen |
. ---Do remember to take this medicine three times a day!
--- ______.
| A．Heard it | B．Made it | C．Got it | D．Taken it |
. You must be there within an hour. There should be no _______ in sending the information.
| A．question | B．hesitation | C．delay | D．problem |
Mike told me that you would pay a visit to Japan, ______?
| A．would you | B．wouldn’t you | C．did you | D．didn’t you |
. One third of the area ______ covered with trees. About seventy percent of the trees ______ been planted recently.
| A．is; has | B．is; have | C．are; have | D．are; has |
Nowadays teens prefer going to the net-bar ______ they can chat with their friends by QQ or play computer games ______ some more reading.
| A．which; rather than do | B．where; to do |
| C．what; doing | D．where; to doing |