1. should go to the doctor a.am thinking b.think c.have been thinking 2. ankle while a.sprained, was playing b.sprained, played c.was spraining, was playing 3. your accident a .was hearing b .have heard c.didn't heard 5. tablets today a.am taking b.have been taking c.have taken 5.my since he left university a.has been treating b.was treating c .treated 6. i am wet, because a.am swimming b.have been swimming c.swam