题目内容：

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Restaurant owners have to know how    1    （make）food. They also have to

know how to make money. Here are some things they  2   (learn)from scientific studies . The color red makes people hungry . Red also makes customers   3   (eat) faster. Many fast food restaurant, therefore , have red furniture or walls. Soft colors like pink and light blue make people   4 (relax),so they spend more time   5   (eat) their meals. Soft lighting makes people look good , but it makes food look bad.. Loud music may be nice at first, but it soon makes people want  6    (leave). Hard seats also make customers want to eat quickly and  7    (leave) . Many restaurants, especially fast food restaurants,  8   (use) this knowledge to make customers eat faster. Because customers    9    (stay) very long, small restaurants can   10     (serve) many people every day .