You ______ wear sports shoes when you climb a mountain.

--Why are your eyes so red? You _______ have slept well last night.

As we’re students, we __________ obey the school rules.

For those who            go to college, there are still hundreds of high-paying jobs that only require a high school diploma.

–Why don’t you stay at the Baotuquan Hotel?  --You      ! Do you know how expensive that place is?