根据汉语提示完成句子。
1. 你最好不要在这里停车。
You'd ______ ______ ______ your car here.
2. 这房间很脏，充满了废纸。
The room was very dirty. It ______ ______ ______ waste paper.
3. 我认为肚子穿过森林是苦难的。
I think it's difficult ______ ______ ______ the forest alone.
4. 电脑是二十一世纪最重要的发明之一。
The computer is ______ ______ ______ ______ ______ inventions in the twentieth century.
5. 为了赶火车，他们一大早就出发了。
They ______ ______ early in the morning to catch the train.