People are using more and more natural gas, wind and other forms of _____.

The _______ that someday he would succeed cheered him through many disappointments.

The window of our room can give us a good view of the street, in which case we witnessed the accident as if we were at the _____.

Many students like to recite       , which are short,beautiful and rhythmic.

 We were told that it was our _______ to read the text together.