Which sentence contains a gerund?
a. during the night, the temperature plummeted twenty degrees.
b. to navigate the winding road safely, we concentrated intensely.
c. on the first torrid day of summer, we always enjoy swimming.
d. the contemptible birds singing in the yard annoyed us all night.

The answer would be C; On the first torrid day of summer, we always enjoy swimming.

Here's the exact definition of a gerund:

Verbs Used as Nouns. Sometimes in English, a verb is used as a noun. When the verb form is altered and it serves the same function as a noun in the sentence, it is called a gerund.

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answer: he would chuck as much wood as he could chuck if he could chuck wood with a wood chuck