—What’s this _____ English? —It’s a dictionary.A. for B. to C. in
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.
It took him one hour________his homework.
The weather is too dry.Those trees need________.
They had trouble________complete sentences.