21£®In my opinion, _____the government comes up with better ways to control prices, ordinary people won't be able to afford daily necessities£®

       A£®if                                                       B£®when               

       C£®unless                                              D£®whether

22£®My father has a great collection of DVDs of English movies, _____have been sent to him by my aunt in London£®

       A£®most of that                                              B£®most of which                            

       C£®most of them                                                                            D£®most of whom