Choose the correct word for the following definition:

To watch and check a situation carefully for a period of time in order to discover something about it

The knowledge that something exists, or understanding of a situation or subject at the present time based on information or experience

The campsite is situated ______ the beach and set in beautiful woodlands and gardens.

Travelling a long distance

To study a subject in detail, especially in order to discover new information or reach a new understanding

The nearest village is ______ walking distance (approx 1 km ______ the entrance).

By 2030 the figure ______ 1580 million. (be)