This has reduced the amount of wasted food at some schools_____38 percent

If you really have to leave during the meeting, you’d better leave _____ the back door[ ]

While working on the farm， the students ________ a good knowledge of plant life

You know it’s love when all you want is that person to be happy，________you’re not part of their happiness.

Why are you leaving right away You promised to stay two ______ hours.