hou too how to say:

She was at the zoo.
They were at the cinema.
They were in the shoop. shop
He was at the river.

hou too say

She was at the zoo.
They were at the cinema.
They were in the shoop.
He was at the river.

Good job (Neil has already pointed out the typographical errors) Anastasia! I completely agree with your choices of prepositions, just note that one could also say "at the shop" -- the distinction is subtle; "at" is more location / proximity, whereas "in" implies having to do with the business of the shop.

For the other expressions, I also agree with your choice of "at," even though you could theoretically use "in" instead of "at," note that the meaning might change a bit -- in particular, "in the zoo" might imply that she is one of the animals, and "in the river" means he got wet....

How do you say?

She was at the zoo.
They were at the cinema.
They were in the shop.
He was at the river.