______ the rising rent prices in Wuhan can’t compare with those in Beijing and Guangzhou, they still worry current college students．
| A．Even though | B．As though |
| C．In case | D．As long as |
________ a certain doubt among the people as to the practical value of the project.
| A．It has | B．They have |
| C．It remains | D．There remains |
It sounds like something is wrong with the car's engine.________，we'd better take it to the garage immediately.(2011·江苏，33)
| A．Otherwise | B．If not |
| C．But for that | D．If so |
________ a strange plant！I've never seen it before.(2011·辽宁，33)
| A．Which | B．What | C．How | D．Whether |
—Why does the lake smell terrible?
—Because large quantities of water ________.
| A．have polluted | B．is being polluted |
| C．has been polluted | D．have been polluted |
The fact that so many people still smoke in public places ________ that we may need a nationwide campaign to raise awareness of the risks of smoking.
| A．suggest | B．suggests | C．suggested | D．suggesting |