Hi Yousef --
Glad you got to post your pictures. Your coins all look genuine, but they are worn and dark, which detracts from eye appeal. With poor eye appeal, collectors don't buy them, and that lowers value.
Here is my take:
1. Great Britain penny, see this page:
2. US Lincoln cent, value is one cent in US.
3. Third coin, I cannot see the picture, it is too fuzzy.
4. United Arab Emirates 1 fils, see this page:
5. Oman 10 baisa, see this page: