The teacher came into the classroom ___ a smile on her face.A. in B. to C. with
—We'll go to visit Chengdu next week.—_____
It ______ forty-five minutes ______ there by bus.
---- why not swim in the river?---oh, no. our teacher told us _____ here. It’s dangerous.
I can’t swim. And she can’t, _______.
I was doing my homework _______ a dog came in.