It's urgent to upgrade the city's transport  ________ because almost all the roads get flooded after heavy rain.

We can improve the ________ of the inhabitants by reducing pollution

They are building a new waste processing plant to _______ before it is reused or discharged into rivers.

The government is making plans to install sensors and cameras in the city centre to _______ traffic problems and help drivers to avoid traffic jams.

________ can enjoy better health care than people living in the countryside, but they are usually busier and more stressed because of the city's fast pace of life.

Tourists are advised to avoid _______ places in big cities.

The early ______ of the island were involved in farming and fishing.

Farmers should use _____ methods to produce clean and healthy food.