Jawaban:

1. a. you have to be quiet/silent during the exam

  b. Usually placed in school

  c.  Be quite

2. a. Means the place is slippery

   b. To be careful

   c.  When he finished mopping the place/If there is water in random places

3. a. At the librabry

  b. To return all of the books that you've read

  c. Return the books after they read it

4. a. At the cinema

  b. Not to bring food or drink because it is already provided there

  c. To not bring their food or drink

5. a. To not enter when the lights on

  b. Dangerous / Danger