We can’t _____ the fact that there is still a long way togo before we can get rid of pollution. [ ]

I am so busy now. And I don’t care ___________.

Good technique in medicine means less pain and fewer deaths ________ it is our duty to master it[ ]

They________have arrived at lunchtime but their flight was delayed.(2011·全国 )

The radio says that a terrible traffic accident happened sometime ________ 8 a.m. ________ 10 a.m. this morning.