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Ответ:

1 Have you seen Maria recently?  

No, I haven't talked to her since Monday.

2 Why are you tasting the cheese?  

  It smells strange.

3 Where are you going?  

 Shopping. Do you need anything?

4  You look tired.  

  Yes. I have been working since 9 o'clock this morning.

5 Where does Tony live?  

  In London - but at the moment he is staying in Bath.

6 How long have you been waiting for the train?  

  I have been here since 10 o'clock.