Don't be discouraged （ ） you have fallen behind others.
（A）whether
（B）as if
（C）even if
（D）however
（ ） I get to Paris, I'll call you up at the airport.
（A）Since
（B）While
（C）Once
（D）Although
（ ） we have come, let's stay and enjoy it.
（A）For
（B）As
（C）Because
（D）Since
