[难题]各种题目，学霸快来。

The number of people who ___cars ___increasing
A have are B has is C have are D have is /

Is that book ______ he borrowed on Friday?
A. that B. which C. the one D. who

The old man walked in the street, ______.
A.followed by his son B.followed his son B.and following his son D.and followed by his son