After he retired, he keeps on taking exercise to kep fit______a good diet

I have to go to work by taxi because my car _____ atthe garage.

My brother has been teaching ________ he was 21 years old.

.He is________ to spend his special Children’s Day in Yunnan because of the earthquake..

When asked to explain _____ he does to make his students so fascinated with his lessons, the teacher paused and thought deeply. [ ]