Questions

Because a table can have only one primary key

As you were asleep, none of the things could have happened without doing "open your eyes" first.

When you are applying for a job at a call center you should know that there will be moments when unsatisfied customers will get angry on you. The key here is to focus on what is the purpose of the call, maintain your calmness and be polite.

As an answer to this question, you can say that you would rate your level of patience and people friendliness above average. You can back it up with an example from your personal or professional life. 

Component Testing is also called as Module or Unit or Program testing. It is testing of all the components in an application separately.