is one issue that stands out above all the rest, one every student is concerned about, _______ which class he may be from.

_____ the team finished most of their research work? —Yes, but the rest _____ rather difficult. [ ]

What’s wrong with your ipad2? The sound ____is not clear.—Yes. It has been broken for some time. [ ]

She still remembers Beijing University， ____________she graduated five years ago.

Driving past the crossroads, I found a little girl ____ on the sidewalk crying.