20. With the development of economy, his yearly total income , with his reward ______, ______ 62,000 yuan.

A. added to; has added up to　　　　　　　 　 B. added; has added to

C. added up to; added　　　　　　　　 　 　　　 D. adds to; adds up to

19. The environmental disaster is bound to occur ____we have to change the way we live．

A. but　　　　　　 　　 B. although　　　 　　　 C. unless　　　　 　　　 D. in case

18. All over the world there seems _____ people out of work nowadays． A. to have a great many　　　　　　　 　　　 B. to be a great many C. to have a great many of　　 　　　　　 　　　 D. to be a good many of