the new director took office, we have worked ___hours, －that is to say, we work more freely

Having retired from work, he is with the welfare(福利) of the disabled.

the construction of theQinghai-Tibet Railway, 33 migration overpasses have been made_______for herdsof Tibetan antelopes to go through their breeding grounds

Sarah wondered what ______ her 70-year-oldgrandpa would make of the new computer

Studies show that less active students in class require a little more ________.