函数f（x）=2x3+3x2﹣12x+1的增区间是（ ）

阅读下面短文，根据所读内容在表格中的空白处填入恰当的单词。注意：每个空格只填一个单词。
You may admire both the romantic love story and the mysterious city of Rome in the movie Roman Holiday. If you are planning to visit Rome, here are some cultural dos and don’ts you should know.
Coffee Etiquette: Italian breakfast consists of pastry and a cup of Cappuccino or shot of espresso. Cappuccino is generally a morning drink and is not drunk after noon by real Italians. A post-dinner espresso, however, is a common practice.
Dinner Rules: Guests are expected to arrive for dinner reservations at least fifteen minutes late. In many restaurants, printed menus are for tourists. Regular patrons know to ask for the daily specials, which typically feature the freshest ingredients. Bread, is rarely together with butter or olive oil.
Drink the Water: Rome has plenty of public water fountains, and real Romans and their dogs always drink directly from them. Many people also refill their water bottle from these fountains.
Mind the Traffic: Unless there's a traffic light, or you are in a crosswalk, don't expect cars  to stop for you. Though crosswalks go first, in a car – crazy city, still you’d better keep cautious and walk cautiously.
Money: Always have some euros with you. Most major hotels, restaurants, and shops take credit cards, but many smaller operations either will either be unwilling to accept them for smaller purchases or do not accept credit cards at all. ATMs are available around the city and at the airports.
About Soccer: Most Italian men are passionate about their soccer. Arm yourself with some knowledge of Italy's soccer scene, and you will find ready conversation partners almost everywhere.
The Romans: The people here love to share their thoughts, opinions and emotions. They are creative, passionate, playful, occasionally rude or vain but always entertaining, and almost always good – humored.

Theme	Dos and Don’ts in Rome
Eating	▲Always have your breakfast with a cup of drink, Cappuccino or espresso (76)          . ▲Arrive at least fifteen minutes last if you (77)         for dinner. ▲Bread, when served, is rarely (78)       by butter or olive oil. ▲(79)     some daily specials in restaurants directly, as regular customers do.
Drinking	▲Public water fountains are always (80)          by real Romans and their dogs. ▲Refill your water bottles from the fountains, too.
Traffic rules	▲Never expect cars to stop for you unless in a crosswalk or there is a traffic light. ▲When you are in a crosswalk, you’d better keep (81)      .
(82)	▲Have some euros with you for smaller (83)         , because not all shops take credit cards.
Communicating	▲Start your (84)           with local people by talking about Italian soccer and they will be (85)       to share their opinions with you.