1.Don‘t throw waste paper______（everywhere/anywhere）
everywhere 到处,处处 anywhere 任何地方
2.Bruce is______college.He is a college student now.
A.on B.in C.at D.to
C be at college 上大学 be at work 上班 等等.
3.Many______students took part in the sports meeting last week.
A.hundred B.hundreds C.hundred of D.hundreds of
A hundred 前有数词修饰时不hundred 不+ s
4.Most people send message to others______e-mail.
A.with B.in C.on D.by
D by 强调通过某种方式,途经 而on 无此意 by e-mail 可视为固定搭配
(这个希望解释一下on和by作“通过”之意时有什么区别）