Choose the correct options

1. He feels exhausted. He
   [studies|is studying|has been studying] all day long.
2. I
   [don't see|aren't seeing|haven't seen] Sally for several weeks. How is she?
3. My aunt
   [thinks|is thinking|has been thinking] she'll have a salad, but she can't decide yet.
4. [Do you hear|Are you hearing|Have you been hearing] that sound? I wonder what's happening.
5. Dorothy
   [is counting|has counted|has been counting] calories, so she
   [is preferring|prefers|has peferred] not to have sugar in her coffee.
6. The conference
   [takes|took|is taking] place upstairs today because the ground floor is occupied.
7. Jasmine
   [finishes|is finishing|has finished] the reports recently. Can you take them up to Mrs Smith?
8. Guess what! I
   [become|have become|have been becoming] a chief manager since we last met!
9. Wow! Smells delicious. What
   [do you cook|are you cook|have you been cooking]?
10. Excuse me, waiter! We
    [wait|is waiting|have been waiting] for our order for over forty minutes already!