【C5】A．SinceB．AsC．ThereforeD．Although

【C12】A．SinceB．AsC．WhileD．What

【C8】A．SinceB．AsC．IfD．Though

A．sinceB．asC．whenD．until

【C4】A．sinceB．asC．soD．thus

【C5】A．sinceB．soC．andD．but

【C5】A．SinceB．After a whileC．AgainD．Before long