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

—Must I take out the trash?—No,  you ________.

The lady in this photo ________ be over fifty! She looks so young!

–Carla _______ go to that historical museum after school when she was a teenager. --No wonder she is so familiar with it. 

(2012·辽宁高考)One of our rules is that every student ________ wear school uniform while at school.