【C13】A．alsoB．becauseC．asD．so

【C13】A．insteadB．becauseC．outD．regardless

【C15】A．andB．becauseC．butD．so

【C13】A．althoughB．whenC．asD．even if

【C13】A．asB．becauseC．thoughD．that

【C3】A．ButB．BecauseC．AndD．So

【C2】A．so thatB．becauseC．unlessD．though