1) My friends don't go to the USA twice a year. My friends go to the USA once a year.
2) They aren't visiting Dallas at the moment. They're visiting Houston at the moment.
3) It isn't hot in New York in winter. It's cold in New York in winter.
4) It isn't raining there today. It is snowing there today.
5) I don't watch American films. I watch Russian films.