Question

fill in the blanks to complete each sentence with the appropriate word.
the fossil fuels industry, which methods that some consider environmentally objectionable, has come under fire for a method called “fracking.”
fracking is just one of the techniques that invasive methods to remove natural gas from ground deposits.
however, fracking is the only one of such techniques that a high - pressure mixture of water and chemicals injected directly into the ground.
use uses
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Explanation:

1. For the first blank: The subject "the fossil fuels industry" is singular, so we use "uses" (third - person singular present tense of "use").
2. For the second blank: The relative pronoun "that" refers to "techniques" (plural), so we use "use" (plural form of the verb).
3. For the third blank: The relative pronoun "that" refers to "the only one" (singular), so we use "uses" (third - person singular present tense of "use").

Answer:

1. The fossil fuels industry, which $\boldsymbol{uses}$ methods that some consider environmentally objectionable, has come under fire for a method called "fracking."
2. Fracking is just one of the techniques that $\boldsymbol{use}$ invasive methods to remove natural gas from ground deposits.
3. However, fracking is the only one of such techniques that $\boldsymbol{uses}$ a high - pressure mixture of water and chemicals injected directly into the ground.