Most children start to walk ________ about their age of 12 months old.

A．at

B．on

C．in

D．of

Everyone thinks Helen is ________ because she never tells lies.

A．helpful

B．generous

C．honest

D．polite

The life in Nora’s school is different from that in ________.

A．us

B．we

C．our

D．ours

Mr. Green ________ live on Jiefang Road. But I’m not sure about it.

A．may

B．would

C．should

D．must

Harbin ________ a lot of special help and care for the travelers from the south.

A．prepares

B．prevents

C．provides

D．protects

We believe the action will ________ better and better environment for both humans and nature.

A．listen to

B．get to

C．write to

D．lead to