Not until all the fish died in the river how specious the pollution was.
| A．did the villagers realize | B．that the villagers realized |
| C．the villagers did realize | D．didn’t the villagers realize |
If English ______ included in the examinations, few students would choose it.
| A．weren’t | B．isn’t | C．hasn’t been | D．hadn’t been |
The student will be suspended from school _____ he apologizes to his desk-mate before the class.
| A．even | B．when | C．unless | D．once |
The small fishing village has ______ into a modern city in thirty years.
| A．extended | B．existed | C．explored | D．expanded |
Mr. Keller ______ forty cigarettes a day until he gave it up.
| A．had smoked | B．smokes | C．have smoked | D．smoked |
--- Do you know that man?
--- Not really, just a nodding _______.
| A．acquaintance | B．participant | C．relation | D．frequent |