【题目】—I'm sorry I can't go to the theater with you.

【题目】The famous artist's works ________ the background of the society at that time.

【题目】—I didn't go to the concert last night because of too much homework.

【题目】—What kind of movies do you like best, Jane?

【题目】After a day's hard work, I like listening to ________ music that helps me fall asleep.

【题目】—You look really ________, Ann. What's wrong?

【题目】I'm going to the market to buy some meat and vegetables, so I will have to ________ my restaurant for several hours.

【题目】—Can you sing along________ us?

【题目】—Could you tell me__________so early yesterday?

【题目】Ladies and gentlemen, the plane is about to__________off. Please__________off your cell phone or make sure it is in flight mode(模式).