A:Mr.Li,everybody is here【except 】Jim Green.
B:Where is he?Do you know?
A:He 【has gone 】to Beijing 【for 】a holiday with his family.
B:【When】did he leave?
A:Last Sunday.And he won't be back 【until 】September.
B:I know.Thank you ,Wang Tao.【By 】the way,have you【been 】to Beijing?
A:Yes,twice.
B:【How】do you like is then?
A:It's great.There are many places of great 【interest 】in Beijing.第三个空为什么用gonehave / has gone to 表示“已经去了某地（还没有回来）”本句话意思是：他已经和家人一起去北京度假了。