She is a well­known doctor now, but she ________ as a cleaner at the hospital for five years.

Scientists have many theories about how the universe ___ into being.

My mother asked me where _____, and I told her that I was going to buy some food.

The telephone _____ three times in the last hour, and each time it _____ for my sister.

 When I was in Spain last summer, I ______ quite a lot of Spanish.