ve taughthundreds of students,___________ having been working in their fields for years.

he moment babies are born, parents are helping them to be released into the world, not to＿＿them or to control their lives for the rest of life.

Tommy，can you ________ these wordswith the pictures一Sorry，I can’t．

His luggage includes two large caseswhich ________ as much as 50kg.

When Jack arrived, he learned Mary _____. [ ]