Why is "unas" used for scissors and not "un" or "una"?

Looking for u r .pls me with these words.give me the spanish words for these .hi,u r welcome, never,good morning, happy birthday.

Proyecto: ¡a conversar! this project serves two purposes: to practice using spanish vocabulary that deals with shopping and bargaining to practice describing or giving information in spanish in writing remember, when you're asked to write in spanish, if you know a spanish-speaker, possibly a native speaker, it's to have that person read what you wrote and you make corrections and maybe give you a few ideas on how you can improve your writing skills in spanish. use the spanish vocabulary in this project to you with the conversation you'll write.

I’m having some issues on the incorrect ones “boxed yellow” how would i reword it to be direct or indirect object sentences? you for your time