It all began in 1877_____ Thomas Edison made the first recording of a human voice．

A．when             B．that            C．where                D．how

--This model plane looks a bit different，isn’t it?

--Yes．The wings seem _____ of its body．

A．more than the length twice                B．twice more than the length

C．more than twice the length                      D．more twice than the length

--How surprised that I happened to meet Mathews last night!

--if my memory serves me correctly，you _____ each other for ten years．

A．hadn’t seen       B．haven’t seen      C．didn’t see       D．don’t see

Nowadays，an increase in the price of drugs has _____ the rising cost of medical care，about which the patients are complaining bitterly．

A．relied on           B．kept up        C．resulted from       D．contributed to

If the new invention had been _____ the working conditions of the coal miners，there wouldn’t have been such a serious accident．

A．applying to improve                      B．applied to improving

C．applied to improve                       D．apply to improving

The old sailor-found the compass _____ in his sailing across the Atlantic alone．

A．a great value        B．great value         C．great valuable          D．of valuable

In order to protect the boy's eyes，his parents have fixed an _____ desk lamp for him．

A．available           B．adjustable          C．accessible           D．acceptable

--How much do you know about the 3D film technology?

--A little．Not until _____ the hot movie Avatar _____ something about it．

A．did I see；did I begin to learn            B．I saw；I began to learn

C．I saw；did I begin to learn                      D．did I see；I began to learn

_____ over many years，the underground system is now able to transport millions of people effectively．

A．Being developed                                       B．Developing

C．To develop                                            D．Having been developed

Misunderstandings _____ from lack of social communication，unless _____ properly may lead to serious problems．

A．arisen；handling                         B．arising；handled

C．rising；handled                         D．risen；handling