中译英，求助!

看看我的吧！
1.2007年3月1日~5月初实际进口汽车500辆
we physically imported 500 cars from 1st March to the beginning of May in 2007.
2.上个月海关核定小组进行了核定
All the cars were inspected last month by maritime-customs inspection authority.
3.我们希望海关能考虑下企业的困难,豁免关税
we hope Customs can waive relative duties and taxes under consideration of difficulties our company has confronted.
4.我上周去海关沟通,争取到缴纳保证金方式 (是否是延缓缴纳关税但必须要先预缴押金这种方式？如是翻译如下）
And obtain deferment permission by way of paying cash depoist after I strived to communicate further with Customs officers.
5.前天打了申诉报告给海关,但未盖章,仅草稿沟通
The day before yesterday a draft pleading report was presented to customs authority without chopping stampe, a senior negotiation for agreement undertook.
6.下周我会去公司了解情况，进行现场核定
I will be back to company to have on-the-spot check in order to get further information.
7.请计算出具体税额，我们要补税
Can you please calculate detailed tariff amounts, I am afraid we have to pay the dut