已知a，b，c∈R，a²+b²+c²=1．

（Ⅰ）求证：|a+b+c|≤$\sqrt{3}$；

（Ⅱ）若不等式|x﹣1|+|x+1|≥（a﹣b+c）²对一切实数a，b，c恒成立，求实数x的取值范围．

请认真阅读下面短文，并根据各题所给首字母的提示，写出一个合适的英语单词完整、正确的形式，使短文通顺。

 Are you looking forward to the weekend？You are not the only one who enjoys it. People in the UK a ____ get excited about the weekend，as it is a time to go out and get together with family and f ____  .

 Saturday morning is time for s ____   . For boys，football is the usual choice，while girls often go to dance or fitness classes. On Saturday afternoon，the shopping malls become b____  .Young people hang out，looking at clothes，playing music or video games. Older people like to s____ on Saturday too. They take a trip to the supermarket if they need  s ____  for their house. It’s time for people to show off their new clothes on Saturday  n____  .They usually dress up and go out for fun. Some people go out for dinner，to all kinds of  r____  —Italian，Japanese，French or Chinese.21·cn·jy·com

 Many shops，banks and companies  c ____  on Sunday. Most people don’t work and they usually have a family day. They have a big l ____  with roast beef，roast potatoes，gravy（肉汁）and vegetables. This often leads to a quiet night，since everyone is very full at noon.

下列各组词语中，有两个错别字的一组是（    ）