(    )1. I think _______ is impossible for him to work out such a difficult problem alone.

        A. this         B. that         C. it        D. he

(    )2. I _______that I can be a successful woman m the future.

        A. wish                      B. hope

C. want                      D. think

(    )3. You'd better speak in English. It doesn't _______ that you may make mistakes

        A. work                      B. matter

C. affect                      D. perform