A.optimisticB.optionalC.outstandingD.obviousHe is（）abou……

单项选择题We agreed to accept（）they thought was the best tourist guide.

A.whatever
B.whomever
C.whichever
D.whoever

单项选择题Wouldn't you rather your child（）to bed early?

A.go
B.went
C.would go
D.goes

单项选择题Before they left the factory, all the cars were carefully tested for（）

A.defects
B.flaws
C.faults
D.errors

单项选择题A 200-year-old building is very old in American（）

A.terms
B.points
C.outlooks
D.definitions

单项选择题He who wants to succeed must（）difficulties and bitterness first.

A.undertake
B.understand
C.undergo
D.underline