Peter is busy _ _ at school, but he never forgets _ __ exercise every day.A. working; doing B. working; to do C. at work; doing
— What can we learn from Lei Feng? — We should not only think about , we should think about others as well.
It’s a good habit to turn off the unnecessary lights, it can help save .
In the United States, Father's Day falls on ________ third Sunday in ________ June.
-Could you tell me this summer holiday?-Tibet.
-Your watch looks new. How long have you it? -For about one year.