It happened to be upstairs

碰巧───happen;楼上───upstairs

If you don't anticipate what may happen , you'll find yourself at a loss when sth . crops up.───你如果没有思想准备, 事到临头就会抓瞎.

He couldn't help worrying obsessively about what would happen.───他禁不住时刻担心将会发生的事情。

It is conceivable that there will be a new economic crisis throughout the world, but we hope it won't happen.───人们相信一场新的经济危机可能再次席卷全球, 但是我们希望它不要发生.

I go all tingly when I think of what might happen.───我一想到可能发生的事就满心欢喜。

There is no saying what may happen.───简直不知今后情况会怎么样.

Do drop in if you happen to be passing!───如果你碰巧经过时进来坐坐.

If anything should happen to him, that would be too bad.───如什么意外的事临到他的头上, 可就糟了.

Nothing will happen for a few years yet.───几年内还不会有什么事发生。