【C12】A．becauseB．thatC．whatD．if

A．theseB．thatC．whatD．which

【C8】A．whichB．thatC．whatD．when

【C5】A．whichB．thatC．whatD．than

【C12】A．becauseB．whileC．althoughD．so

【C6】A．whichB．thatC．whatD．where

【C16】A．ifB．thatC．whatD．whether