Find the topic sentences in the essay on p. 72. Which sentences support them? Suggest alternative ones.

Topic sentences
There are many positive aspects to banning cars from city centres.
On the other hand, banning cars totally from city centres would have its disadvantages.

Supporting sentences
To begin with, it would help to drastically reduce air and noise pollution. Firstly, it would be very inconvenient for millions of people.

Alternatives
To start with, it would reduce traffic jams. To begin with, it would make shopping awkward.