— Why are you so popular with your students?— As a teacher, I seldom give my students so difficult a problem ____ they cannot work out.

Rose asked Tom, “Did you see my purse?”  Rose asked Tom ___. 

My grandma still treats me like a child. She can’t imagine        grown up.

.On April Fool’s Day people often play tricks _____ others.

--- The patient looks much better.    is it that has made him      he is today?--- Perhaps the special medicine and his family’s patient care.