1.D
只有D suggest所引导的宾语从句才会使用虚拟语气,即要求该从句的谓语动词由“should + 动词原形”构成,且should可以省略.
即：Who do you suggest the newspaper send to cover the bank robbery?
= Who do you suggest the newspaper (should) send to cover the bank robbery?
(为便于楼主理解)= Do you suggest the newspaper (should) send (who/whom) to cover the bank robbery?
否则的话,该句子中的send都必须改成will send.
2.A
翻译：--他完成了工作吗?--还没呢.尽管他整天工作,然而他还是不能完成那个任务.
despite和in spite of都是介词,不是连词,不能引导状语从句,排除CD；
B中的as意思是“因为”,不符合转折的句意,排除.
3.C
whether在此题中是从属连词,经常和or连用,意思是“无论/不管...还是...”,不过从句最好把顺序调整为：whether it is serious or minor.
如果有however的答案,则更佳.
再如：I'll go swimming whether it is cold or hot.
不管/无论天气是冷还是热,我都会去游泳.
4.D it
只有it可以做形式主语,代指后面真正的主语being a sailor.
5.D
翻译：--你什么时候开始工作?
A.It’s none of your business.“和你无关/不关你事”,太过粗鲁不礼貌；
B.It varies“它会变化/有不同”,句意太过突兀,不妥.
C.From 8am to 4pm.“从上午八点到下午四点”,这是工作延续的时间（段）,不是工作开始的时间（刻）.
D.it doesn't make any difference.“没有影响/都一样”,意即“什么时候开始工作都一样/没有差别”.