这次战役是世界史上著名的战役，它扭转了整个战争的局势，是北美英属殖民地十三州独立战争的转折点。它不仅增强了美国人民争取胜利的信心，也为美国人民抗英斗争创造了有利的国际条件。这次战役是（　　）

把由1开始的自然数依次写下来：

1 2 3 4 5 6 7 8 9 10 11 12 13 14…．

重新分组，按三个数字为一组：

123，456，789，101，112，131，…，

问第10个数是几？

阅读下面的短文，从方框中选择单词，根据实际情况用单词的适当形式填空，使短文意思完整、通顺。每空一词，每词只能用一次。

      Young people and older people don't always agree with each other. They sometimes have ____  ideas about work and life. But in one special program in New York State, adults and teenagers live together in a ____  way.

      Each summer 200 teenagers and 50____  live and work together for eight weeks as a group. Everyone works several hours each day. Some teenagers work in the forest or on the farms. Some learn to make things like tables and chairs and build houses. The adults ____  them theses skills.

      There are several free hours every weekday. Weekends are free, ____ . During the free hours, some of the teenagers learn photo taking or painting. ____ sit around and talk or sing. Each teenager chooses his own way to ____ his free time.

      When people live together, rules are necessary, In this program the teenagers and the adults make the rules together. If someone breaks a ____ , the problem is brought to the whole group. They talk about it and ask, “How did it happen? ____  should we do about it?”

      One of the teenagers says about his experience, “____  stop thinking only about yourself. You learn to think about the group.”