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 3 (make) people hungry. Red also makes customers 4 (eat) fast food restaurants, therefore, have red furniture or walls. Soft colors like pink and light blue make people 5 ( relax), so they spend more time 6 (eat) their meals. Soft lighting 7 ( make )people look good, but it makes food look bad. Loud music makes people want 8 ( leave). Hard seats also 9 ( make ) customers want to eat quickly and leave. Many restaurants, especially fast food restaurants, use this knowledge 10 (make) customers eat faster.