问几道外贸函电的英语填空题 都是些介词的填写,英语达人帮帮忙吧

问几道外贸函电的英语填空题 都是些介词的填写,英语达人帮帮忙吧
1.we take this opportunity to introduce ourselces__one of the important dealers__the line of hard ware in China
2.All the models illustrated can be supplied__stock__competitive prices shown on the pricelist inside the catalogue
3.Ww take pleasure in quoting the price as shown in the following firm offer delivered today__ __acceptance by 5pm on the 30th of this June.
4.However,it is __tha your price is too high to __to business
5.Please sign and return one copy__our file at you earliest.
上面好像有的单词打的时候打错了。不过你们是英语达人，应该看的懂的哦~