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