到目前为止，我们已经学了四年的英语。

__________,we ______________________ English for 4 years.

The newly-built railway reaches as far as the next town.

远至...，和...一样远

5.I guess some of you are dreaming of becoming an astronaut and traveling to space to carry out space exploration.

n.When he was young, his dream was to become an actor.

I had a strange/frightening dream last night.

I saw her on a street in my dream.

v. dream of (about).../that...

The soldiers often dream of home.

I dreamed that I was back at school.

dream of doing... 梦想做...

你昨晚梦见什么了？

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小时候我常梦想成为一名警察.

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carry out:实行；执行；进行

By the end of last month ,our factory had successfully carried out its production plan for this year.

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这工作一旦开始，就必须完成。

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carry on:继续；进行；经营; 继续活动，进行下去

6.If this comes true, you'll probably travel by space shuttle.

当 realize 作实现讲时,相当于 come true . 但 realize 是及物动词,后面必须跟宾语,有被动语态.而 come true 不及物,无被动语态,物作主语.

He _________his dream/hope at last.

=His hope was ___________at last.

His hope ________________at last.

He came true his hope at last.