i make game for android ,i want know how to make time to pause the game if the time out ? and how to make the numbers of time appear in screen should i make numbers in blender then import it in unity then write codes ? and how to make score with numbers ,too?

take a look at Unity - Manual: Immediate Mode GUI (IMGUI)

Then you can write things like Time.time to a GUI element. see Unity - Scripting API: Time