Условие задания:

3 Б.
Read these sentences and complete them with should or should have + the verb in brackets.
Write your answers, don't use capital letters.
  
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1. I’m in a difficult position. What do you think I _____? (do)
 
   
 
2. I’m sorry that I didn’t take your advice. I _________ what you said. (do)
 
   
   
3. I posted the letter three days ago, so it _________ by now. (arrive)
 
   
Источники:

Raymond Murphy. English grammar in use- Cambridge: CUP, 379p.