1. The correct answer is (D).

                     2.  The correct answer is (A).

                     3. The correct answer is (D).

                     4. The correct answer is (B).

                     5. The correct answer is (C).

                     6. The correct answer is (D).

                     7. The correct answer is (A).

                     8. The correct answer is (B).

                     9. The correct answer is (D).

                    11.The correct answer is (A).

                    12.The correct answer is (D).

                    13.The correct answer is (A).

                    14.The correct answer is (C).

                    15.The correct answer is (A).

                    16.The correct answer is (C).

                    17.The correct answer is (C).

                    18.The correct answer is (A).

                    19.The correct answer is (B).