—________will your father come back，Tony? —In three days.
A．How long B．How soon C．How D．How many
I'm sure that there____more trees in our country in the future.
A．have B．are C．will have D．will be
—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
