—What do you think of the song “You and Me”? —It _______ great. I love singing it.
They volunteer________at the local hospital.
That boy looks very unhappy.Let’s________.
His sister usually helps him________his homework.
—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.