Fossil fuels are the most common sources of energy. We have been using them (6)---- the Industrial Revolution. People around the world (7)---- burning coal, oil, and natural gas more than 100 years ago, to heat their homes and to power factories and vehicles. And today, people (8)---- these fossil fuels for most of their energy needs. But there is a big problem: burning fossil fuels releases carbon dioxide into the atmosphere and causes global warming. Therefore, our climate (9)---- now. Hopefully, scientists and governments (10)---- ways to stop climate change in two years' time at the latest.

1.
A) for
B) while
C) since
D) by
E) during

2.
A) have started
B) start
C) were starting
D) started
E) will have started

3.
A) have used
B) are using
C) used
D) were using
E) have been using

4.
A) is changing
B) would be changing
C) was changing
D) will be changing
E) will have changed

5.
A) would find
B) will have found
C) are finding
D) will be finding
E) have found

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