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 |
The cakes are delicious. He’d like to have __ third one because __ second one is rather too small.
| A．a, a | B．the, the | C．a, the | D．the, a |
One way to understand thousands of new words is to gain __ good knowledge of basic word of formation.
| A．/ | B．the | C．a | D．one |
Jumping out of __ airplane at ten thousand feet is quite __ exciting experience.
| A．/, the | B．/, an | C．an, an | D．the, the |
I don’t like talking on __ telephone; I prefer writing __ letter.
| A．a, the | B．the, / | C．the, the | D．a, / |
A bullet hit the soldier and he was wounded in __ leg.
| A．a | B．one | C．the | D．his |