The cost of oil is less than _______ of gas.
| A．it | B．one | C．the one | D．that |
We’ll pay a ______visit to the beautiful city if we have enough time.
| A．a four-days | B．a four-day | C．four days | D．a four day |
Our company forbids ______, that is to say, we are not allowed ______here.
| A．to smoke; to smoke | B．smoking; smoking |
| C．smoking; to smoke | D．to smoke; smoking |
It was not rare in ______that 
people in ______fifties went to university for further education.
| A．1980s; their | B．the 1980s; the | C．the 1980s; their | D．1980s; the |
Yesterday my car suddenly ______on my way to work.
| A．broke up | B．broke out | C．broke in | D．broke down |
He sent me an e-mail, ______to get further information.
| A．hoped | B．to hope | C．ho ping |
D．hope |