The story took place in Europe in the days before automobiles ________ everyone used horses．

A．which

B．when

C．where

D．as

Shanghai ________ by the cold front starting tomorrow and the mercury could drop to zero．

A．will be affected

B．will affect

C．is affected

D．affected

The defining issue of our time is how to keep that promise alive．No challenge is ________ urgent．

A．less

B．more

C．pretty

D．even

Understanding the cultural habits of another country, especially ________ containing many different subcultures like the USA, is a difficult thing．

A．which

B．that

C．one

D．those

Good parents try to be sensitive ________ all their children's needs．

A．with

B．on

C．to

D．of

The advantage of living on the top of the building is that I can get a good ________

of the whole city．

A．scene

B．view

C．scenery

D．look

Ten years ago, the population of our town was ________ that of theirs．

A．as twice as

B．twice as large as

C．twice as much as

D．as twice much as

This problem may lead to more serious ones if ________ unsolved．

A．making

B．left

C．remained

D．keeping

At the meeting, the old man ________ some good advice and all the people there agreed with him．

A．came about

B．came along

C．came up with

D．came out

With a lot of difficult problems ________ , the newly-elected Prime Minister is having a hard time．

A．settled

B．settling

C．to settle

D．being settled