________the difference between the two research findings will be one of the worst mistakes you make.

They are so busy that they have no time to do any sports, ______they need to do so.

Let’s try our best to ____ paper to savethe trees.

Dobecarefulwhilecrossingthestreet.Ifnotyoumayget_______byapassingcar.

alone in the dark room, the littlegirl was so frightened as to cry loudly