Do you still remember the chicken farm _______ we visited last year?
| A．where | B．when | C．that | D．what |
Not until all the fish died in the lake __________ how serious the pollution was.
| A．did the villagers realize | B．the villagers realized |
| C．realized the villagers | D．do the villagers realize |
A student at a Nevada middle school opened fire on campus, wounding two l2-year-old boys and__________ a math teacher.
| A．kill | B．killing | C．killed | D．to kill |
It never will rain roses. __________ we want to have more roses. we must plant trees.
| A．When | B．Unless | C．Until | D．While |
I really don’t know _________ I put my wallet after I paid the bill．
| A．where was it | B．it was where that |
| C．where was it that | D．where it was that |
During the examination we are required to stay in our seats, keep our eyes on our work, ____ to anyone.
| A．instead of speaking | B．rather than speak |
| C．and not to speak | D．but would not speak |