The spokesman said that this was a（n）____negotiation （谈判） because it solved a lot of problems between the two sides．
| A．attractive | B．defensive | C．protective | D．productive |
My parents used ________they had to get a new car for my brother.
| A．which | B．all what |
| C．what | D．不填 |
Chicago is on ________ Lake Michigan. There is nothing in the world like ________ Chicago meat industry.
| A．the；the | B．不填；不填 |
| C．the；不填 | D．不填；the |
Do you think the reason ________ he gave is believable?
| A．for which | B．which | C．why | D．what |
This is an illness that can result in total blindness ________ left untreated.
| A．after | B．if |
| C．since | D．unless |
Paper produced every year is ________ the world’s production of vehicles.
| A．the three times weight of | B．three times the weight of |
| C．as three times heavy as | D．three times as heavier as |