Its the past tense for tread. tread- to walk in a specific way
<span>I think it would be runs through. Pervades means to spread through all parts of something so I'm sure the answer is D.</span>
The suffix <em>-phile</em> is used for making nouns and adejctives that describe a person who loves or likes something a lot. In other words, it means someone who likes or enjoys certain things.
In this case, the root word is <em>biblio </em>which means book.
Whe the root word and the suffix are combined, <em>biblio + phile</em>, it forms a new word which is used to refer to a person who loves books. It also refers to that person that collects them.
An adjective clause functions as an adjective, that is, it gives some information about a noun in a sentence (or a pronoun) ( information which is not an action).
The noun modified here is "knife" and the information about the knife, that is the complete adjective clause is "<span> that his dad gave him.
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