Adverbial clause of condition and comparison

He runs much faster _____ I do. A. than                      B. as                    C. so                            D. like

She is not _____ tall as her brother.                                               A. so                    B. as                       C. than               D. more

She speaks French _____ a native speaker does. A. as fluently as B. more fluently C. as fluently D. so fluently

_____ you study hard, you will pass the exam.                                A. Unless                  B. If                      C. Although            D. Because

He promised to help us _____ we needed his support.              A. however                  B. as if          C. provided that        D. unless

The more you practice, _____ you will become. A. the better B. the most better C. better than D. as better as