_________ my grandfather grew older, he lost interest in everything except fishing.
A．While B．When C．As D．Since
It was along the Mississippi River _________ Mark Twain spent much of his childhood.
A．how B．which C．that D．where
It is a fact that _________ differences between countries may cause misunderstandings in communication.
A．historical B．cultural C．personal D．financial
North Europe __________ Norway, Sweden, Denmark, Finland and Iceland.
A．is consisted of B．consists of C．is made up D．makes up
I was greatly impressed __________ the speech by the mayor of Shanghai before the final voting for EXPO 2010.
A．to B．over C．with D．on
When I entered the step-classroom (阶梯教室), the lecture __________ and the audience __________ attentively.
A．began, listened B．was begun, was listening
C．had begun, listened D．had begun, were listening
