1.  are
2.  am
3.  yes
4.  is
5.  right

• 1. 是: It's high time | be | are | be short for
• 2. 我是歌手: I Am A Singer | IamaSin | Survival I'm a Singer | I am singer
• 3. 我是传奇: I Am Legend | XCVII | XCII | XCIV

更多释义

• 1.重要的是经验—年龄是次要的。
  Experience is what matters—age is of secondary importance.
  dict.yoduao.com
• 2.某些课程是必修的，其他是选修的。
  Certain courses are compulsory, others are optional.
  dict.yoduao.com
• 3.他的论据要点是改革是必要的。
  The thrust of his argument was that change was needed.
  dict.yoduao.com

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