Thanks to the (a)   , pedestrians can be much safer.

A (a)   is a bridge that carries one road over another one.

The railroad track that runs overhead is known as a (a)   .

A road or path that goes under another road or railroad track is called an (a)   .

The clanging sound of the Ha Noi (a)   in the 1970s has gone deep into people's collective memory.

Our grandparents used to live in an (a)   .

My mother is a (a)   woman. She always cares about how we feel.

The boys are willing to do what you want them to. They are really (a)   .

She is (a)   with her children even when they misbehave.

Nowadays the (a)   is becoming more common in the cities.

Having students work in groups, she hoped they could learn to be (a)   .