【C17】A．previousB．presentC．thenD．current

【C4】A．thatB．whileC．thenD．when

A．HoweverB．WhileC．ThenD．Therefore

A．previousB．foremostC．firstD．front

【C18】A．previousB．devotedC．latestD．efficient

【C2】A．presentingB．to presentC．presentedD．presents

【C6】A．lendB．presentC．borrowD．put