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 |
Scientists hope to____soon in their fight against heart disease.
| A．break up | B．break out | C．break through | D．break in |
We haven’t heard from her for long, so we give her_____for dead.
| A．out | B．in | C．up | D．away |
Does the amount of rain_____the growth of crops?
| A．influence | B．effect | C．affect | D．increase |
In our school it is a rule that the students are banned______computer games.
| A．of playing | B．on playing | C．from playing | D．to play |
A great many students have dropped out of school and now the number of our class has____51.
| A．increased to | B．increased by | C．reduced by | D．reduced to |