William Sidney Porter, known as O. Henry, is most famous for ______.

单项选择题The villagers have already known ______ we'll do is to build the bridge.

单项选择题The new librarian still doesn't know ______ the out of date newspapers and magazines.

单项选择题Bats are surprisingly long-lived creatures, some ______ a life span of around 20 years.

单项选择题What the correspondent sent us is an ______ news report. We can depend on it.

单项选择题People have always been（）about exactly how life on earth began.

A.curious
B.excited
C.anxious
D.careful