Vocabulary Review （1）

4. a file transferred onto a computer from another computer or the internet
5. feeling shame because something bad, wrong, or foolish was done
8. feel happy because something unpleasant has not happened or is no longer happening.
10. indicate that something is so nearly true that for most purposes it can be regarded as true.
12. start using the system, usually by typing name or identity code and a password.
14. a photograph that you take of yourself, especially using a mobile phone
15. a short article or programme in which their life and character are described.
16. an adjustment to a computer program
17. to impart ( knowledge) or exchange ( thoughts, feelings, or ideas) by speech, writing, gestures, etc
20. a great success or achievement, often one that has been gained with a lot of skill or effort.
21. interrupt what they are doing and upset them.

1. extremely important or absolutely necessary to a particular subject, situation, or activity.
2. easy to do, use, or get to; causing little trouble or work;
3. opposite to something regarded as positive;
6. having a feeling of or filled with frustration; dissatisfied
7. you move the text up or down to find the information that you need.
9. to enter (a country, territory, etc) by military force
11. disconnected from a computer;
13. performing or functioning in the best possible manner with the least waste of time and effort;
18. to cause (a device) to stop operating
19. to copy or transfer ( data or a program) from one's own computer into the memory of another computer