1.

 Why does Michael phone Tracy? 

   Because he wants to talk to Jennifer.
   Because he wants to talk to Tracy.

2.

Where is Jennifer, exactly?

   She's having dinner with her parents.
   She's at her grandparents' house.

3.

What does Tracy suggest Michael?

   To call again and go out to dinner.
   To leave Jennifer a message on the machine.

4.

What does Tracy promise Michael?

   Not to listen to his message.
   Not to worry about Jennifer.