欧美日韩黄网欧美日韩日B片|二区无码视频网站|欧美AAAA小视频|久久99爱视频播放|日本久久成人免费视频|性交黄色毛片特黄色性交毛片|91久久伊人日韩插穴|国产三级A片电影网站|亚州无码成人激情视频|国产又黄又粗又猛又爽的

It's really very dangerous.One more step，________ the baby will fall into the well.

There is still much to discuss；________，we shall return to this topic at the next meeting.

Knowledge is the food of thought ________，as long as it is put in our brain，we will grow wiser.

Help others whenever you can________you will make the world a nicer place to live in.

You have failed two tests.You'd better start working harder, ________you won't pass the course.

I thought we'd be late for the concert，________ we ended up getting there ahead of time.

It is often said that the joy of traveling is ________ in arriving at your destination ________ in the journey itself.

The last time we had great fun was ________ we were visiting the Water Park.

Part of the reason Charles Dickens loved his own novel，David Copperfield，was ________ it was rather closely modeled on his own life.(2010·北京)

(2012·四川)Scientists study ________ human brains work to make computers.