More and more people have come to realize that if we had taken effective measures much earlier, the air quality ______ so seriously now.
| A．is not polluted | B．would not be polluted |
| C．had not been polluted | D．would not have been polluted |
He gave a lot of presents to his friends, but never one to me.
| A．has he given | B．he has given |
| C．does he give | D．he gives |
In spite of his own safety, the boy, , jumped into the river to save the girl in the water.
| A．risked to be drowned | B．risked drowning |
| C．risking to be drowned | D．risking drowning |
She married an Australian man and became a (n) citizen of that country.
| A．automatic | B．permanent | C．contemporary | D．religious |
his homework, Little Tom has to stay in his room for another hour.
| A．Not finishing | B．Not having finished |
| C．Not finished | D．Having not finished |
you keep away from them, they won’t do you any harm.
| A．As long as | B．Even if | C．As far as | D．As if |