No matter how much time you spend planning a trip, things still _____ go wrong and air travel is no exception—from weather delays to lost luggage.

 I didn’t like the color of the coat my mother bought me, so she went back to _______ it for another one.

– I’m sorry I stepped on your toe; it was an accident. – It wasn’t! You did it ______.

_______by the teacher, she took two books away from the reading room.

—Have you heard that he was admitted into Beijing University?—Is that true? And I'm glad that his efforts at last ___．