We are supposed to use the word in parentheses to form a new word and fill in the blank. We can do it as follows:
1. On our arrival, we were greeted by the head of the department.
The word in parentheses, "arrive", is a verb. However, what the sentence needs is not a verb, but a noun.
The noun we must come up with needs to be derived from the verb "arrive". It must mean the action of arriving somewhere.
The only possible option is "arrival". It is formed by adding the suffix -al to "arrive" to transform it into a noun. Another example of using the suffix to make a noun out of a verb is "renew -renewal."
With that in mind, we can correctly complete the sentence as: On our arrival, we were greeted by the head of the department.
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