Many countries are increasing their use of natural gas, wind and other forms of ______.

. Our teacher has a __________ for thinking up ways _________ his speeches attractive.

This is a new ______ to language teaching, which can stimulate students’ interest to learn the language.

Now that taking exercise will build up your       , you should try to run in the morning.

In spite of the city’s crowded urban environment, opportunities for outdoor _______ are never lacking.