One of the rules is that every student ________ wear school uniform while at school.

My sister met him at the Grand Theater yesterday afternoon, so he _______ your lecture.

When the traffic lights are red, we _______ stop.

—Look at the young lady in red. Is it Mrs. King?—No, It ________ be her. She is wearing a white dress today.

—Why, my new computer is rubbish! Five hours has passed and it still hasn’t finished the downloading. —Don’t worry. You know, sometimes the Internet ________ be very slow.