问题补充:
----There can be no life on the earth without water.
----That’s right. Water everywhere.
A. needs
B. is needing
C. is needed
D. needed
答案:
A. needs
B. is needing
(答案→)C. is needed
D. needed
解析:句意:没有水,地球上就不会有生命。——是的,到处都需要水。结合语境可知下文描述的是客观性的动作,故用一般现在时态。主语是动作对象,故用被动语态,选C。