我们刚上高速公路不久，车就开始发出奇怪的声音。

Shortly ___after we joined the motorway, the car started making a strange noise.

我离开你后，立刻去了邮局。

I went to the post office immediately ___after I left you.

我希望我回家后我们能很快见面。

I hope we will meet soon ___after I return home.