are found on all kinds of trees,butthey differ greatly_____ size and shape

Thewhy he is absenttoday is he hasgot a bad headache.

John _____ knowledge of radio just by staying around the radio station.

He has been out of work for three months; as a result, he has to _____ on family expenses by one-third.

I think watching __________ TV is bad for our eyes. —Me too.