—Why are you so excited today?

—We were told ____ a picnic this weekend.

A．have                    B．to have

C．having                  D．had

I found a letter ______ on the floor when I came into the classroom.

A．lying                  B．lay

C．lie                    D．lies

The children decide _____ their school yard this Friday afternoon.

A．clean                  B．to clean

C．cleaning                D．cleaned

The boy is often heard _____in the music room. He sings very well.

A．practice singing          B．to practice singing           C．practiced singing

Animals are our close friends. We are supposed _____ them.

A．to protect            B．protecting           C．protect

The Great Green Wall can stop the wind and sand­_____ to the rich land in the south of China.

A．move              B．to move          C．from moving

—Excuse me. Could you tell me ____get to the nearest post office?

—Sorry, I am new here.

A．how can I           B．how I could

C．how to              D．what I can

He promised _____his old friend during his stay in Tianjin.

A．see                B．seeing

C．saw                 D．to see

—What a heavy rain!

—So it is. I prefer ____ rather than ___on such a rainy day.

A．to go out; stay at home           B．to stay at home; go out

C．going out; stay at home           D．staying at home ; go out

How kind you are! You always do what you can ______ others.

A．help                  B．helping

C．helps                 D．to help