What is the best verb for this sentence? slowly, samantha (walked, tiptoed) across the carpet.

Walked would be the best verb because of two reasons.

1. It flows better in the sentence

2. It fits. If the sentence had something before or after it indicating that Samantha had to be stealthy (or something like that) then tiptoed would be better but it doesn't so it isn't.

i think its d

hope i can you

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."