If we had taken such effective measures much earlier, the river ________ so seriously now.
| A．is not polluted | B．would not be polluted |
| C．had not been polluted | D．would not have been polluted |
More and more attention has been drawn to the fact that many children are ________ in the countryside when their parents flood into the cities for jobs.
| A．left off | B．left aside | C．left out | D．left behind |
--How did you find your visit to Qingdao, Joanna?
--________.
| A．Oh, wonderful indeed | B．I went there alone |
| C．First by train and then by ship | D．A guide showed me the way |
Mr. Black ________ for Shanghai in a few days. Do you know when the earliest plane ________ on Sunday?
| A．leaves; takes off | B．leaves; is taking off |
| C．is leaving; is taking off | D．is leaving; takes off |
To pay to see that movie seems foolish ________ you can see it on television for free.
| A．before | B．though | C．when | D．once |