When do we have to use the article 'the' and when we don't have to use it?

c. in the address bar

c) in the address bar

explanation:

this is the only place where url's may be found or entered in to successfully get to a web page.

the pronoun reference replaces a noun, but you have to make sure there's no room for confusion.

in the first sentence "her" could be referring to shely or to the sister. the answer there is "shelly called her sister and told her about the new baby."

in the second sentence "it" could be referring to the roof or the floor. the answer there is "since the roof leaks on the family room floor, we need to repair the roof."

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