25．A．quick                         B．fastest                  C．faster                     D．fast

A

24．A．not at all              B．not only               C．both                             D．either

23．A．invents                B．is invented           C．was invented          D．invented

22．A．on                       B．by                       C．in                        D．with

21．A．faster                         B．quickly                C．slowly                   D．quick

20．A．others                  B．the other              C．other                    D．another

19．A．better                         B．well                       C．best                       D．good

18．A．be helped             B．help                    C．helping                D．to help

17．A．with                    B．of                       C．for                        D．to

16．A．wider                         B．more wide                  C．widely                   D．wide