______ was not until the early 20^th century _____ the importance of his ideas was realized.

It’s one’s bad habits, rather than a certain natural disaster,       one’s longevity (长寿)for most of the time.

It is not how much we do but how much love we put into what we do _____ benefits our work most.

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

It was in such a good place ______ everyone wanted to go and visit ______ I came across the old lady.

_________ you met with such a strange man yesterday?

When was it________you let out the secret?

It was with great joy       the couple found their missing son after 18 years.

It was the news _________ he got the first prize ________ made his father excited.

It was some time later        I realized he had lied to me.