ではありません

ではありません is a polite version of じゃない, which is the plain negation of BOTH ある and いる. When you negate in plain form, you don't make a distinction between animate and inanimate.
ではありません is a stock phrase used regardless of the living status of what it describes.

Source: http://answers.yahoo.com/question/index;_ylt=As79K9A1AsPCbB2hT9BiQWjq1KIX;_ylv=3?qid=20110605101603AAgM4x4

どうする

どうする？
What should I do?
What will I do?

どうするの？
What are you going to do?

Source:　http://answers.yahoo.com/question/index?qid=20100804201600AA16o4K
http://answers.yahoo.com/question/index;_ylt=AuJ08l7kQs8ULa1zNggFugIjzKIX;_ylv=3?qid=20120117173000AANaM74

How do you say "I give up?"

give up:
もう止める（もうやめる）
もう参った（もうまいった）
降参（こうさん）
諦める（あきらめる）

When to use different forms of saying 'give up':

I give up (もう止めた,もう待った, 降参)
give up smoking. (止める)
give up the ideas (諦める, すてる)
give up trying to help him (諦める)
give up the presidency (ゆずる)
give oneself up to the police (自首（じしゅ）する)
its too early to give up (あきらめる)

Source: http://answers.yahoo.com/question/index?qid=20080207060222AAY9mBH