题目内容：

Every morning, kids from a high school are working hard. They are _1.     and selling special coffee at a coffee shop. They are also making a lot of money.

These students can make up to nine 2.     _ dollars a day. They are selling their special coffee to airplane passengers. After the students get paid, the _3.     of the money goes to a local youth project.

These high school students use a space in the Oakland airport. It is 4.     very crowded. Many people who _5.     on the planes like to drink the special coffee.

One customer _6.     that the coffee costs a lot but it is good and worth it. Most customers are pleasant but some are unhappy. 7.     do not like it if the coffee cafe is not open for business.

The students earn $ 6.10 an hour. They also get school credit while they learn _8.     to run a business. Many of the students enjoy the work  9.     it took some time to learn how to do it.

They have to learn how to heat milk, load the pots, and add flavor. It takes some skill and sometimes 10.     are made. The most common mistake is forgetting to add the coffee.