If you s________ a gas leak, do not strike a match or even turn on an electric light.
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If you'd like to recognize the greenness of an i_________ or organization, why not nominate them for an Environmental Achievement Award.
There are two main forms of lower back pain: acute and c_________.
The team are working hard to a________ the problem so that they can find the best solution.
A combination of i________ and external factors caused the company to close down.