A．andB．orC．soD．but

【C5】A．andB．howeverC．soD．therefore

【C11】A．andB．orC．thoughD．while

【C12】A．andB．orC．thanD．as

【C6】A．andB．orC．forD．but

【C5】A．andB．orC．elseD．also

【C9】A．otherwiseB．orC．soD．yet