1. Led by Lincoln£¬the American blacks fought bravely ______ their rights and managed to be_______ slavery.

¡¡¡¡A. with ; free from                             B. for; against

¡¡¡¡C. for; free from                                D. against; for

2. _________ the development of science, job positions are becoming fewer and fewer, so many people are worried about ________ they would be out of work.

¡¡¡¡A. With; if                                         B. As; whether

¡¡¡¡C. With; whether                                D. As; if