10. None of the students have come to class yet, _______________?                                                                   A. has one?                 B. have they?                        C. have them?                D. haven't they?                           11. Paper was first               to make paper money, playing cards or the world’s oldest book – the Diamond Sutra – in the 2nd century by the Chinese.                                                                                                               A. to invent                  B. inventing                           C. being invented         D. invented                                  13. Go and invite her out! You need to _________ while the iron is still hot                                                        A. hit                            B. strike                                C. forge                          D. hammer                                14. I know I shouldn't trust people blindly, but I just couldn't help _______ the beggars money                             A. be given                  B. giving                               C. give                            D. to give                                        15. Not only _________ us with the preparation, but he also saw it through till the end                                       A. he helps                  B. he helped                          C. that he helped             D. did he help