Be careful,there’re many pitfalls.

1.It seems that living green is easy and affordable. A small step masks a big difference.

A. exactly B. fortunately C. surprisingly D. hardly

2. As there is less and less coal and oil, scientists are exploring new ways of making use of ______ energy, such as sunlight, wind and water for power and fuel.

A. primary B. alternative C. instant D. unique

3. The questionnaire takes ______ ten to fifteen minutes to complete and can be used along with the assessment interview.

A. mainly B. punctually C. approximately D. precisely

4.I can be a teacher. I’m not a very patient person.

A. seldom B. ever C. never D. always