1.( )fired,your health care and other benefits will not be immediately cut down.
A would you be B should you be C could you be D mingt you be

2.for Tim this was the beginging of a new life,( )he htought he would never see.
A what B that C one D it

3.she wsa so angry at all( )he was doing (　）she walked out and said nothing
A that;that B what;that C what;as Dthat; which

4.liu xiang's breaking the world record was an exciting moment,( )all of us will never forget.
A that B one C it D what

5.this is the old man who saw her( )up from childhood.
A grow B growing C grew D was growing

6.who do you suggest ( )the letter?
A to post B posting C post D posted

请选择并解释一下为什么,非常感谢

1、(B)
该题为省略连词IF的虚拟条件句，须将情态动词提前。正常完整语序为（If）you should be fired,···即使你应该被开除的话，医疗保险和其他福利不会立即终止。
涉及情态动词的用法，should有“应该”的意思，could用于委婉请求或是否定、疑问句中表示推测或怀疑，might表示没有把握的推测，would表示意愿。
3、（A）
第一个that引导宾语从句，第二个so···that
5、（A）
see sb do sth 看到某人做某事，
see sb doing sth 看见某人正在作某事
6、（C）
you suggest （that）who (should)+动词原型.从句中用虚拟语气
2、4
我觉得应该用which，都有“，”是非限制性定语从句
关系代词that和关系副词why不能引导非限制性定语从句
it one也不能用，那样的话两个句子中间没连词。