ex 4 p.80

We have to go over/ across the street to leave our rubbish

• over

• across

• don't care about this =^

They can't go ___ home because the flood damage their huse

Driving slowly ___ a city is bad for air pollution

A lot of pollution comes from the road which goes right ___ the city

The water can't flow freely ___ the bridge because there is too much rubbish

• under

• back

• quần què

The article had a photo of birds walking ___ a street , unable to fly because of air pollution

This is the first stage ___ creating a cleaner city

We need to get ___ from the city because it's too polluted