Select the best way to complete these sentences. Choose A, B, C, or D

1. They _____________ there for a long time.

   1.   ?    have living
   2.   ?    are live
   3.   ?    have been living
   4.   ?    has been living

2. She ___________ her lessons carefully.

   1.   ?    prepare
   2.   ?    preparing
   3.   ?    prepares
   4.   ?    have prepared