The number of people in the world__________ about 6 billion and large quantities of waste ____ each year.
15. He is better than _______ I last visited him.
14. Why do you want a new job ____ you’ve got such a good one already?
13. Don’t play by the river _______ you fall in and drown!
12. I thought she was the very girl that I should marry _______ I met her.
11. ____ you’re got a chance, you might as well make full use of it.