— Are these pants yours?— .A. Yes, it isB. Yes, they areC. No, it isn’t
Most of us will spend most time _____lessons.
My brother spent all morning_____ soccer with his classmates.
When we went into the park, we saw someone _____ Chinese Kungfu.
Lisa used to ________the bus to go to school,but now she is used to ________there.
Students should learn how ________ problem.