Air quality in Britain has improved considerably in the last 30 years. Total

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问题 Air quality in Britain has improved considerably
in the last 30 years. Total emissions of
smoke in the air have risen by over 85 per cent       【1】______
since 1950. The domestic smoking control             【2】______
program has been particularly important in achieving
this result. London and other major cities are no    【3】______
longer have the dense smoke-laden "smogs" of the
1950s, but in central London winter sunshine has    【4】______
increased about 70 per cent since 1958.             【5】______
Since 1990, daily air pollution data from the
British monitoring network has been made available    【6】______
to the public by the Department of the
Environment’s Air Quality Bulletins. These give the
concentrations of three main pollutants--ozone, nitrogen
dioxide and sulfur dioxide -- and grade air quality
on a scale between "very weak" and "very             【7】______
good". The information features in television and
radio weather reports, appears in many national and 【8】______
local newspapers. Therefore, the data are available 【9】______
on a special free telephone number and on videotext
systems.
A comprehensive review of the issue of urban
air quality was published in January 1992. Three
independent committees of which experts have been    【10】______
established to advise on different aspects of the problem,
and will set guidelines and targets for air quality.
The network is also being extended and up-
graded at a cost of ￡ 10 million. [br] 【M3】

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答案将are省略掉。

解析根据句子结构，我们可以看出这里使用了两个动词，因此要删除are。

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