I can’t imagine what air we would be breathing in if we __________ anything to stop air pollution.
| A．hadn’t done | B．didn’t do |
| C．haven’t done | D．don’t do |
Idon'tknowwhatdecisions______attheconferenceasJohnhasn'treportedtomeyet.
| A．wouldmake | B．willmake | C．aremade | D．weremade |
—I'mgoingawayfortheweekend.
—Butyou_____you______outtodinnerwithme.
| A．say;willcome | B．say;came |
| C．said;wouldcome | D．havesaid;willmade |
Yourcoughought______beforeitgetsworse.
| A．tosee | B．tobeseen | C．toseeto | D．tobeseento |
Jackson______toworkingovernmentofficethoughhehatedservingthere.
| A．wanted | B．waswanted | C．waswanting | D．hadwanted |
E-mail,aswellastelephones,______animportantpartindailycommunication.
| A．isbeingplayed | B．areplaying | C．haveplayed | D．isplaying |