Choose the correct forms of the verbs

1. The train
   [is leaving|leaves]
   at 10 p.m. Would you like to buy a ticket?
2. [Have you seen|Have you been seeing]
   Mary before? She looks wonderful in these new pink shoes.
3. I promise
   [I am buying|I will buy]
   a puppy for you but not today.
4. Mary
   [waits|is waiting]
   for you in the garden.
5. Every Saturday Mary
   [works|has worked]
   as a babysitter.
6. Someone is knocking. I
   [open|'ll open]
   the door.
7. My sister
   [is often interrupting|often interrupts]
   me while I'm talking on the phone. It drives me crazy!