long|longer|longest

他们很快就要到家了。

They'll be home before very ___long.

不久之后，他们意识到生活在那里的大多数动物在欧洲可能是一笔大生意。

Before ___long they realized that most of the animals which lived there could be big business in Europe.

我们很快就会完成这个项目。

We'll finish the project before too ___long.

这座桥比我们昨天过的那座更长。

This bridge is ___longer than the one we crossed yesterday.

亚马逊河是南美洲最长的河流。

The Amazon River is the ___longest river in South America.