Correct the sentence 2. the boys they could of visited us if we had known they were in the neighborhood

3.this spring said julio were taking a trip to visit the east

Which sentence is punctuated correctly? the shoes normally cost 40 dollars, however; we got them on sale. the shoes normally cost 40 dollars however we got them on sale. the shoes normally cost 40 dollars, however, we got them on sale. the shoes normally cost 40 dollars; however, we got them on sale.