Bob has learned a lot from his _______ of working in different gyms and is now an expert on all kinds of _______.
My mother is ill. I _______stay at home and look after her.
---Do you know the Frenchman? ---Yes. I ______him for two years.
They______ all their money, so they have to walk home.
Great changes_______ in the city, and a lot of factories_______.
---When did Kate’s grandma die? ---While the doctors______ on her.