---How much is the pair of shoes?----Thirty dollars ________ enough.A. is B. are C. be
—Your tea smells great! —It’s from India.Would you like________?
The World Health Organization has given some advice on________to protect us from being infected(感染)with H7N9.
—What do you usually help your mother________? —I often do the dishes.
--How clean the window is! --Yes. It ________ just now.
--Where is Jim? --He ________ Chengdu.