单项选择题 The police knew the （） of the accident.

单项选择题 The pilot turned engine （） and is ready to take off.

单项选择题 Progress has been （） in aeroplane design.

单项选择题 The question was so difficult that （） people could answer it.

单项选择题 She took her handkerchief out （） her pocket.

单项选择题 He is excited （） the good news.

单项选择题 He took the other road to avoid （） her.

单项选择题 I’d like to have an economy （）.

单项选择题 We can finish this work （） a few hours.

单项选择题 He was （） a box on his shoulder.

单项选择题 He checked in late, （） he didn’t get a window seat.

单项选择题 Tom （） his flight by twenty minutes.

单项选择题 She’s going to （） that new dress.

单项选择题 Two birds escaped （） their cage.

单项选择题 Can you （） what is wrong with the washing machine?

单项选择题 We ran all the way to （） the bus that was going to the zoo.

单项选择题 It was Dr. Rontgen who （） X-rays.

单项选择题 There is （） information on how to get the cheap fears.

单项选择题 They decided to （） into the cause of the accident.

单项选择题 This is one of the most important things （） all.