Some insects_____ the colour of their surroundings (环境) to protect themselves.
| A．take up | B．take off | C．take on | D．take out |
--The research on the new bird flu virus vaccine is challenging and demanding. Who do you think can do the job?
--________ my students have a try?
| A．Should | B．Shall | C．Will | D．May |
How long do you thinkthe car factory launches a new model?
| A．will it be until | B．it will be before |
| C．will it be when | D．it will be that |
—Haven’t you solved the problem yet?
—Sorry, but I promise it in an hour.
| A．will be settled | B．will settle |
| C．has been settled | D．has settled |
________ the heavy snow came, the weather got colder and colder.
| A．As | B．Since | C．With | D．While |
Jackson as well as his classmatesgoing to learn Shakespeare’s works next week, of which somehard to understand.
| A．are; is | B．are; are | C．is; is | D．is; are |