Lewis was much admired ______ his work on the advanced medical research.
The manager urged older staff ________early retirement and new staff _______ more time for work.
The monkey suddenly emerged ________ the tree, frightening Lucy into screaming.
21st Century, _____ weekly newspaper, provides us with ______ variety of fresh articles about campus studies and life.
After living there for one year, they have _______there.
________ with the size of the whole earth, the biggest ocean does not seem big at all.