In big cities, serious traffic ______ often make people late for work and school.

He is looking for the post office but doesn’t know ______ to find it.

The more traffic there is on the road, ______ the air becomes.

If the city builds more parks, people ______ have more places to relax.

Many people in big cities are tired of the traffic ______ during rush hour.

The tourists can’t decide ______ to visit first: the park or the night market.

The higher the buildings are, ______ the view from the top becomes.

If the weather is bad tomorrow, we ______ stay at home and play board games.

A modern city usually has many public ______ such as parks, libraries and hospitals.

I’m planning a trip to Hue, but I don’t know ______ to stay: in a hotel or a motel.

The more people drive cars in the city, ______ the traffic becomes.

If you don’t follow the traffic rules, you ______ have an accident.

There are too many ______ on the road in the morning, so the city centre is very noisy.

My brother asked me ______ to buy good food: in the market or in the shopping malls.

The faster a city grows, ______ its problems become.

If people use public transport, they ______ reduce traffic jams in the city.

Cars, motorbikes and factories cause air ______ in big cities.

We have no idea ______ to ask for help when we get lost in the city: a local resident or a passerby.

The more cars there are on the roads, ______ the air becomes.

If we plant more trees along the streets, the city ______ be cleaner and greener.