单项选择题
Peter was（）the lawn around the roses.
A.trimming B.tripping up C.ripping off D.dripping
单项选择题 The children are quite unlikely to be（）to the new teacher.
单项选择题 Her father gave her the（）of going on to college or starting to work.
单项选择题 Economic benefits must be weighed（）the possible dangers of handling radioactive waste.
