1 petition letter 需要簽名嗎？如果簽自己的名字的話，petition letter是用第三人稱寫的，會不會奇怪？
Yes. It is not strange.
2 論證requiring laber certification would adversely affect American interest的時候，是不是最好mention一下there is no labor shortage in the field? 如果是的話，要通過什麽證明no labor shortage呢？
It is not necessary for this part.
3 是裝訂的問題，我想把所以的材料訂在一起，那是不是140表上也可以打兩個洞，然後用一個binder訂在一起呢？
You can surely punch two hole on the top of your I-140 form and bind them together. But not with a binder. You need to use paper fastening.
Yes. It is not strange.
2 論證requiring laber certification would adversely affect American interest的時候，是不是最好mention一下there is no labor shortage in the field? 如果是的話，要通過什麽證明no labor shortage呢？
It is not necessary for this part.
3 是裝訂的問題，我想把所以的材料訂在一起，那是不是140表上也可以打兩個洞，然後用一個binder訂在一起呢？
You can surely punch two hole on the top of your I-140 form and bind them together. But not with a binder. You need to use paper fastening.
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