You will fail in the driving test （ ） you have more practice.
（A）unless
（B）when
（C）since
（D）after
He says （ ） clearly that beginners understand most of his words.
（A）such
（B）so
（C）such a
（D）so a
（ ） I get to Paris, I'll call you up at the airport.
（A）Since
（B）While
（C）Once
（D）Although
