Thirty dollars ________ too expensive.
| A．are | B．is | C．were | D．be |
--You should have thanked her before you left.
--I meant ________, but when I was leaving I couldn’t find her anywhere.
| A．to do | B．to | C．doing | D．doing so |
Many people are ________ as to what to do when there is a fire.
| A．at a loss | B．at risk | C．at ease | D．at a distance |
Girls used to take fewer advanced math courses than boys but now they are taking just _______.
| A．as much | B．so much | C．as many | D．so many |
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 |