The possibility __________ pleasant smells might reduce pain has recently been suggested by new research.

  Soon they got to a point where two roads met; they didn’t know _________.

 With him ______ the way, we had little trouble finding the school.

With trees and grass__________39.6% of the urban area，the city has taken on a new look.

The subway was crowded with passengers going home from market, most of ________carrying heavy bags and baskets full of fruits and vegetables they had bought there.