3. Choose the correct options.
   
   1. I need some emails.
      a) to answer b) answer c) answering
      
   2. The situation is difficult _ __ .
      a) for explain b) explain c) to explain
      
   3. I don't know what
      a) do b) to do c) that I do
      
   4. I don't really mind ___ housework.
      a) do b) to do c) doing
      
   5. is one of the best forms of exercise.
      a) Swimming b) Swimming c) Swim
      6.___ bring our books tomorrow?
      a) Do we have to b) Have we to c) Do we must
      
   6. It's free. You __ pay.
      a) don't have to

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