53. In 1989, a(n) _______law was passed by the United Nations to stop people putting waste into sea.

32．The car passed through the streets__________we thought was a very dangerous speed

milk is much morewidespread，at least 22 dairy companies and their milk products that have appearednationwide

After trying five times, Carol finally passed her driving test.-After all, _______．

All the students ______ their study _______ all the lights went out.