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 |
John received an invitation to dinner, and with his work ________, he gladly accepted it.
| A．finished | B．finishing | C．having finished | D．was finished |
He was educated at the local high school, ______ he went on to Beijing University.
| A．after which | B．after that | C．in which | D．in that |
—Ouch! You hurt me!
—I am sorry. But Iany harm. Ito drive a rat out.
| A．didn’t mean; tried | B．don’t mean; am trying |
| C．haven’t meant; tried | D．didn’t mean; was trying |
He didn’t make __________ clear when and where the meeting would be held.
| A．this | B．that | C．it | D．these |
Dogs have a very good ___________ of smell and are often used to search for survivors in an earthquake.
| A．sense | B．view | C．means | D．idea |