1.lack 的用法 请详细讲解做名词 做动词

1.lack 的用法 请详细讲解做名词 做动词
Although ___work experience at that time,he managed to accomplish the task.
A.lacked B lacking C lack D to lack
2.____ a fine day,my best friend gave me a call and we decided to go swimming
A Being B It being C To be D It is
答案是B为什么
3.____wastre water in many rivers in our coty have been cleaned because of the effective measures.
A a great number of B large quantities of C a number of D plenty of
答得好一定会追加分