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

The students bein the classroom because there are lights in it.

The young girl couldn’t afford a new car. ______, shebought a used one.

Who would you rather ________ your place since you are in hospital？

Are you going to climb the mountain tomorrow–Yes. But if it ______, I_______ at home.