高二英语

1 C

LACK在这里是动词。lack== are in need of -- -, want - - --

2 A

PUT INTO USE在这里是被动语态结构，过去分词做时间状语使用。

PUT into use in April 2010 == WHEN the hotline was put into use - - - - .

3 B

LACKING在这里是现在分词表达“转折”。though l;acking变成句子就是：

though they lacked money.