Many people think they have to spend a lot of money to keep healthy. Leading a healthy lifestyle doesn't have to cost much, .
Out ______ when the bell rang.
When he was a child, he ______ watch TV whenever he wanted to.
Professor John will give us a lecture on how to learn English, but when and where _____ yet.
Having taken our seats, _______.
Do you think the reason _______ he gave is believable?