Harvard President A. Lawrence Lowell has introduced the ______ system which offers undergraduates informal specialized instruction in their fields and now it is still a distinctive feature of Harvard education.

A．How to produce pollution free bus.
B．How to prevent our environment from being polluted.
C．Whether to ride a passenger bus or a private car.
D．How to reduce the pollutants produced by bus.

A．The bookshelf won’t fit in the kitchen.
B．The man will give the woman some books.
C．The man will help the woman a little later.
D．The woman needs help in the kitchen.