cram|crammed|cramming

他拼命把所有的书都塞进了已经装满的背包里。

He tried to ___cram all his books into the already full backpack.

公交车上挤满了赶着上班的人。

The bus was ___crammed with people rushing to work.

我们勉强把十个人塞进了这个小房间。

We were ___cramming ten people into this small room.