Verb conjugation of "oír" in Spanish

It is a column header, the column itself has 2 buttons 'thumb up' and 'thumb down'... And I am looking for the title of the header. Then I want you to simply mark those words and sentences that are wrong or have typos.
They are longer than most examples given by online dictionaries, they resemble actually more to a language study book. Please do the rest of the sample words later today and with 2 pairs each and send them over when you are ready.
Have you ever visited the U.S. before and if so, where have you been in the U.S.? I've been travelling in California, it was very amazing. We have traveled by car. Here are my corrections.