--Oh no! I put my bag down here, but now it's gone.
--（）. Shall I call the police.

A．Make a direct eye contact with an American
B．Try to hug a Muslim woman
C．Bow to a Japanese when you first meet
D．Smile to a French in order to show that you are happy

A．Going over the lessons with them.
B．Encouraging them from time to time.
C．Helping them with study plans.
D．Offering them a special place.