短文填空。阅读短文，并用括号内所给动词的适当形式填空，必要时，可加助动词或情态动词等。

     Restaurants owners have to know how to make food. They also 1______ (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______ (stay) shorter than others do. Many restaurants 5______ (have)

red furniture or walls. Soft colors make people 6______ (relax) so they spend more time 7______ (eat) their

meals. Loud music makes people want 8______ (leave). Hard seats also makes customers want to eat quickly.

Many restaurants 9______ (use) this knowledge 10______ (cause) customers to eat faster.