—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
