Is this your schoolbag?

.An American goes to your school.You say to him_____.A.Welcome back to schoolB.on this piece of paperC.You'er welcomeD.Welcome to school is this your skirt this is your Maybe this is your Is this your uncle? this is your aunt. is this your business Is this your schoolbag? Is this your (空格) Is this your schoolbag? this is your pencil Is this your cake. This is your explanation? Is this your-----photo This is your destiny Is this?your friend is ——what did your teacher say this morning.——sha asked me _________this morning.A.how did Tom come to schoolB.why was Tom late for shool.C.when Tom would get to shool. This is your?is this your?求区别!