（1）its plans to promote disarmaments,the party has decided to establish a campaign headquarters with Benjamin Seaman as its leader.
<B>To carry out
（2）pure lead,the lead ore is mined,then smelted,and finally refined.
[D]It is obtained
（3）When they met,Leonardo and his enemy were fighting.
[A]killed each other
<B>killing each other
[C]to be killed each other
[D]to kill each other
It's very kind of you to say so./I am pretty pleased to hear the news that you are elected as the president of the club./I'm sorry to interrupt you./They are quite surprised to see the great changes taking place in the area.