Read the text. Choose from sentences the one which fits each gap (1–5).
MISSING SUN
Pollution in many of the world’s cities is becoming a major health problem. One of the worst affected is Beijing, the capital of China. Air quality was dangerously low on 58 days last year. Winter months are especially bad. (1) ____. There is also less wind to blow the smog away. At this time of year, pollution levels are sometimes 20 times higher than the WHO (World Health Organisation) considers safe. This causes illnesses and on the worst days old people and children are advised to stay indoors. Visibility is sometimes so bad that motorways have to close because of the danger of accidents.
These ideas should help to reduce pollution in the future, which will improve health standards in major cities.
This is the time of year when more coal is burned to heat people’s homes.
Another target is older, more polluting cars. The worst offenders will be banned.
However, as the real one was hidden, they had to do this on giant TV screens.
