—Mike，you________play the piano well if you don't work hard.
—I know，Mom.
A．don't B．won't C．doesn't D．didn't
You will________take a holiday after the exams.
A．can B．could C．be able to D．are able to
.Could you please pass me two ________？
A．pieces paper B．piece paper
C．pieces of paper D．pieces of papers
Everyone should play a part_____the earth.
A．to save B．saved
C．for saving D．in saving
Please check your paper to ________ there are no mistakes.
A．think of B．try out C．find out D．make sure
Liu Xi's father kept on____although he was tired.
A．to sleep B．sleeping C．to work D．working
