[A] before[B] by[C] with[D] round

A．Get a ride home with Nancy.B．Find a place to live.C．Go to the store before it closes

Before 1500 North America was inhabited by more than 300 cultural groups, each with differ

Antarctic _____ we know very little is covered with thick ice all the year round. A．which B．that C．w

___________[A] with [B] about [C] among [D] by

A.Get a ride home with Nancy.B.Find a place to live.C.Go to the store before it closes

A.Come to her office before her meeting.B.Change his major.C.Meet with her tomorrow.D.