Over 20% of the students at that school _____ the habit of smoking, which is beyond imagination.
| A．is | B．are | C．has | D．have |
The storm is moving slowly____________.
| A．eastern | B．to eastern | C．to eastwards | D．eastwards |
. He made up his mind to devote his life____________the river____________polluted.
| A．to prevent, to be | B．to prevent, from being |
| C．to preventing, to be | D．to preventing, from being |
. Many people think that it is ____________making such an experiment.
| A．worthwhile | B．worth | C．worthy | D．valuable |
. One day I ____________a newspaper article about one in six European mammal species threatened with extinction.
| A．came at | B．came across | C．came about | D．came after |
. We can catch____________ sight of millions of stars in____________space.
| A．/, the | B．the, / | C．/, / | D．a , the |