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 |
—Why does the lake smell terrible?
—Because large quantities of water in the lake .
| A．have polluted | B．is being polluted | C．has been polluted | D．have been polluted |
John plays basketball well, _______his favorite sport is badminton.
| A．so | B．or | C．yet | D．for |
The day________ he was looking forward________ in the end.
| A．when; to come | B．which; to come |
| C．when; to came | D．which; to came |
—Who ________ it be that is knocking at the door?
—It________ be Mother, but I’m not sure.
| A．can; must | B．can; may | C．must; can | D．may; must |
If you cheat in the exam, you could hardly________ it.
| A．throw away | B．run away | C．get away with | D．stay away from |