Complete the sentences by choosing suitable words or expressions from the collocation box.Adjectives which often go before:experience ： enjoyable unforgettable amazingopportunity： crucialgoldenlostVerbs / Expressions which often go before:habit：formmaintainbreakconversation：strike upget intoend1. The easiest way to ____________ a habit is to replace it with a new one.2. To plan ahead before you go to the airport can make your waiting time an ____________ experience.3. If you’re learning a new language, __________________ conversations actively with the native people when traveling.4. It can be difficult to ____________ a healthy habit when you’re traveling in a new city and throwing off your regular routines.5. It was the first time that she felt a little sad when she had to get off the train and ____________ the conversation with the stranger.6. Flying in Greenland provides you a _________ opportunity to see glaciers (冰川) flow between the mountains.