某人观察到某一工厂的锅炉汽笛出水后4s才听到汽笛发出的声音，当汽笛喷气发声时，这个人距离锅炉多远？

完成句子。

1.中国以长城而闻名于世.

  China is _________ ____________the Great Wall.

2. 这个星期天你们打算去打篮球吗?

    ______you __________ ___________ play basketball this Sunday?

3. 你的启蒙老师怎么样?

   ________ ________ your first teacher _________?

4. 对于老人来说学习英语更困难.

   It's __________ ________ ________old people _________ _______ English.

5. 你认为昨晚电视上关于詹天佑的那部电影怎么样?

    What ______ you _______ ______ the film ______ Zhan Tianyou _____ television last night?

6. 明天将会有雨.

   There will _________ ___________ tomorrow.

7. 请代我向你的父母问好.

   Please _________ hello ___________ your parents.