However,　　　　 happened later proved me wrong.

—____________ difficulty you meet, remember that it might just be a touchstone. —You are right. __________ difficult it is, we will never give in.

The policy of the mainland is very clear and straightforward，and the key problem is ______ the leaders of Taiwan will accept it.

Please call my secretary to arrange a meeting this afternoon, or ______ it is convenient to you.

 Please check the list carefully ________________ make mistakes.