How to Manage Study in Summer Vacation?

How many possibilities are there in each of the following? Vantika Knows the following sites in Maharashtra. She is planning to visit one of them in her summer vacation. Ajintha, Mahabaleshwar, Lonar Sarovar, Tadoba wildlife sanctuary, Amboli, Raigad, Matheran, Anandavan.

We advised them "to going to" a hill station during the summer vacation.