短文填空，从方框中选择正确的选项，将其字母标号填在文后横线上，完成短文。（选项中有两个是多余选项）（每空1分，计10分）

A. usually    B. mistakes   C. rest    D. hundred   E. what   F. making G. although   H. under     I. They    J. thinks     K. fly     L. how

Every morning, kids from a high school are working hard. They are   and selling special coffee at a coffee shop. They are also making a lot of money.
These students can make up to nine   dollars a day. They are selling their special coffee to airplane passengers. After the students get paid, the   of the money goes to a local youth project.
These high school students use a space in the Oakland airport. It is   very crowded(拥挤的). Many people who   on the planes like to drink the special coffee.
One customer(顾客)   that the coffee costs a lot but it is good and worth it. Most customers are pleasant but some are unhappy.   do not like it if the coffee shop is not open for business.
The students earn $ 6.10 an hour. They also get school credit(学分) while they learn   to run a business. Many of the students enjoy the work   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   are made. The most common mistake is forgetting to add the coffee.