3.6 Герундий или инфинитив

1. For two hundred years almost, the North Pacific humpback whales have returned to the tropic waters of Hawaii. 2. Why they are returning to these particular waters year after year? 3. The humpbacks do not accidentally arrive in Hawaiian waters; they are precise extremely in searching for this specific location, where they gather to complete their breeding rituals. 4. The whales first to arrive are sighted sometime in late November, after completing a 3,000-mile journey. 5. The humpbacks last to migrate to Hawaii arrive by December late or January early.