29．If we had taken such effective measures much earlier, the fiver__________so seriously now.
| A．is not polluted | B．would not be polluted |
| C．had not been polluted | D．would not have been polluted |
－Why is you rprofessor so happy recently?
－Because the throry she insisted on__________correct.
A is proved B provingC was provedD has proved
Was it at the school gate.if I may ask _________ you met your friends from your hometown?
A whereB thatC whichD ones
－Can you tell me the timetable of the school bus?
－Well , the bus_______here for the first trip at 6:30 am
A will leaveB leftC is leaving D leaves
The policemen______the stolen place again and again, and finally they found the evidence who stole the antique
A got throughB picked upC went overD turned over
.What the boss really doubts is _______his employees will go on working in the company
A thatB weather C when D if