Choose the correct option

1. The teacher got annoyed because the student showed a(n)
   [lack|omission|absence|shortage]
   of concentration.
2. The class was
   [split|separated|torn|break]
   up into two teams by the teacher.
3. Many people aren't
   [aware|known|familiar|recognised]
   of the amount of waste produced by their own households.
4. The band performed
   [alive|live|alert|lively]
   on stage at the festival.
5. He had to
   [pass|break|fail|leave]
   a business deal because he didn't have any funds.
6. The teacher is going to
   [gather|flock|collect|group]
   the children according to height.
7. This is a
   [shared|public|private|common]
   park so anyone can use it.
8. We will
   [effort|exert|attempt|advance]
   to finish the project before the end of the month.
9. The sailors managed to
   [transfer|network|transmit|project] an SOS signal before the ship sank.
10. I plan to give some of the money I
    [earn|win|gain|find] from my job to charity.
11. I will [refuse|deny|reject|oppose] if he asks me to sing in front of everyone.
12. There have been several [last|current|recent|later] additions to the old Parliament building.
13. If you don't hurry up, we'll [lose|miss|pass|fail] the train.
14. The accountant [approves|accepted|admitted|agreed] he had made a mistake with the company's figures.
15. I [blame|accuse|fault|charge] myself for not being prepared for the exam.
16. There have been a lot of [differences|shifts|adjustments|changes] at our school this year.
17. J. K. Rowling's Harry Potter books are [known|popular|famous|successful] with young people.
18. The boy had a good [sense|feeling|awareness|impression] of direction and knew where he was going.
19. Smoking cigarettes can [end|finish|conclude|result] in lung cancer.
20. She has the annoying [custom|habit|routine|practice] of biting her nails when she's nervous.