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Liu Ming is _______18-year-old student. He got a gold medal in the competition.

A．a                             B．an                         C．the

—Excuse me. How far is the post office from here?

—It’s about _______walk.

A．ten minute                   B．ten minutes                 C．ten minutes’

John and I will go out for a walk after we _______our homework.

A．finish                        B．finished                     C．will finish

As we know，the Changjiang River is one of _______rivers in the world.

A．long                  B．longer                C．the longest

My hobby is changing all the time. Now I am _______ in collecting coins. It’s_______ and valuable.

A．interesting; interested         B．interested; interesting          C．interested; interest

Excuse me，sir. Could you tell me _______?

A．where can I get a post card

B．where I can get a post card

C．that I could get a post card

—How long _______it _______ you to work out such a difficult problem?

—About thirty minutes.

A．did… take                  B．does… take                 C．did…cost

We used to study in the old building_______ was broken down last year.

A．which                       B．where                       C．what

Our city is becoming nicer. Look! There are many trees and flowers on _______ sides of the streets.

A．all                       B．each                    C．both

Everyone should save every drop of water. Remember to _______the tap after you finish washing.

A．turn off                      B．turn down                            C．turn on