Understanding the cultural habits of another nation, especially ____________ containing as many different subcultures as the United States, is very difficult.
A．one B．that C．some D．the one
As we all know, apples are sold by ____ weight, and socks are sold by _______dozen.
A．the; a B．/; a C．/; the D．the; the
Many difficulties have ______ as a result of the changeover to a new type of fuel.
A．risen B．arisen C．raised D．arose
——Why are the tax collectors so busy?
——Many people prefer to have their tax forms completed by a professional rather than ___.
A．do it themselves B．doing it themselves
C．to do it themselves D．done by themselves
It was in the small house _______ was built with stone by his father _______ he spent his childhood.
A．which , that B．that , which C．which , which D．that ,where
Nothing that he suggested _____ to be of any use.
A．prove B．proved C．proving D．has been proved
