Question

fill in the blanks to complete each sentence with the word most appropriate in the context of the sentence.
firefighters sometimes set intentional and controlled fires in order remove potential fuel for forest fires.
according to the us national parks service, most forest fires are caused by humans; however, the organization points out that lightning and lava can spark fires, .
the national fire protection association defines kinds of acceptable smoke alarms: ionization alarms (which help to warn people about open - flame fires) and photoelectric alarms (which help to warn people about smoldering fires).
two too to
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Explanation:

First Blank:

Step1: Analyze the phrase "in order ____ remove". The structure "in order to + verb" is used to show purpose. So we need "to" here.

<The word "to" fits as it forms "in order to" for purpose.>

Second Blank:

Step2: Look at the sentence "lightning and lava can spark fires, ____". The word "too" means "also" and is used at the end of a positive sentence. So "too" is appropriate.

<"too" is used to add that lightning and lava also spark fires.>

Third Blank:

Step3: The sentence "defines ____ kinds of acceptable smoke alarms" needs a word for quantity. "two" is the number word, and later it lists two types (ionization and photoelectric), so "two" fits.

<"two" indicates the number of kinds of smoke alarms.>

Answer:

First blank: to
Second blank: too
Third blank: two