Nada ningún ni nunca nadie 1. no conozco a 2. no tengo libro. 3. no vamos a la playa 4. no tengo un bolígrafo un lápiz. (the word chosen for this answer would go in both blanks.) 5. no hay en la mesa.

These sentences can be complete in the following way:

1) Nadie.- this would mean that you do not know anyone. 
2) Ningún- it makes reference to the book. you do not have a book
3) nunca. This means that you do not do that activity. you never do it
4) ni. not having one thing nor the other. 
5) nada. this means that the table is empty- nothing on it.

You didn’t attach the list but the sentence translates to “during last summer vacation my wife and i went to costa rica”