Respuesta :
First answer: have.
One should differentiate between the verb “to have” used here for a perfect tense conjugation and the proposition “of”. In speech they may sound similar, but in fact, in the sentence you require the verb for grammatical correctness and meaning.
Second answer: its.
The difference between “its” and “it´s” is that the first is a possessive form of “it” whereas the second one is a contraction of “it is”.
Third answer: loose.
The difference between loose and lose is that the first one means something that is not tight or properly fastened, whereas the second one means to misplace something.