You can go to ____ National Art Gallary but I want to visit ____ zoo first.

 Select the most appropriate option to fill in the blanks.

Q. You can go to ____ National Art Gallery but I want to visit ____ zoo first.

1. the; no word required
2. no word required; the
3. a; a 
4. the; the

Explanation : 

We always use determiner before singular countable noun (Determiner+SCN). Here National Art Gallery and Zoo both are singular countable so we have to use determiner.

We have to use “the” for both blank places.