今天我要参加一家公司举行的“成立两周年纪念日”活动，我要怎样祝福呢？这家公司是做贸易的。

1. Zher4 shi4 yin2hang2 2. Ta1 zai4 yin2hang2, ta1 xiang3 huan4(换）/huan2（还） qian2 3.(I cant understand this one.) 4.Correct 5.Di4tie3 zai4 nar3 6.Wu3 cheng2/cheng2yi3（乘以） san1 shi4 duo1 shao3 7.Shi2 er4 …… 8.Wo3 mu2qin xi2huan1 wo3 de mei4mei 9.Wo3 xiang3 ni3.( Actually, this sentence is usually said as " Wo3 xiang2 ni3")

here it's used as a conjunction. There's no exact word to translate it.

the day after the day after tomorrow the day after tomorrow tomorrow today yesterday the day before yesterday the day before the day before yesterday

I think you are trying to say that the 8th building is around the south of the school,right? If so, you'd better say 八号楼/八栋在学校南边。 Or if the building is named as 八楼, your sentence is totally correct.

Keep practicing, and write after some fonts that you think are beautiful.

忽略：疏忽,不在意;没注意到。Almost the same as "忽视". It's more like ignore, overlook. eg.在这个问题上，他们忽略了一个重要的细节。（ In this case, they ignored an important detail.） 怠慢：1.(对事物)不重视，不当一回事。 2.(对人)不恭敬、冷淡，常用作客套的谦词。 eg.1.怠慢法律，必然招来祸事。2.如有怠慢，请多包涵。( I'm afraid I have been a poor host.) 轻视：小看、不认真看待（常有贬义） despise, look down on eg.她不该因为贫穷而轻视他。( She shouldn't look down on him for poverty.)