我不知道为什么只有一些网页提供了这种在线测试的服务。

I wonder why there are just few web sites offering online quiz like that.

youdao

我知道没有人可以帮我，只有自己站起来才是真的好起来了，我不知道为什么会怎样，想到这一点却做不到这一点。

I know that no one can help me, only their feet up is really good, I do not know why what they think of that can not do this.

youdao

我不知道为什么只有啤酒瓶是可退还的。

I don't know why only beer bottles are refundable.

youdao