Ответ:
1) She has never thought to go to medical school.
2) I don't know where my sister (be) now. Maybe she (sit) in the garden.
3) Don't tease the dog! It will bite you.
4) Look! He is trying to find his watch. He has lost it.
5) Look! Her hands are dirty. She has been working in the garden.
Объяснение: