1. She said, I do not know who he was referring to (refer to) 2. Please explain to them what to do and why they do. (Question word + todo) 3. In the 19th century, 20 years, the government passed a law to protect elephants. (Pass a law) 4. Car that travel at speeds of 50 km per hour with. (At a spend of) 5. Until her child was asleep, she left the room. 就这么多了，不知道合你意不。。。。。。
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