Identify the types of cell junctions that help to stop the leakage of the substances across a tissue and facilitation of communication with neighbouring cells via rapid transfer of ions and molecules.

To identify the correct types of cell junctions described in the question, let us analyze the functions of the major types of junctions found in animal tissues:
1. Tight Junctions: These junctions establish a barrier that prevents the leakage of water, ions, and molecules across the space between adjacent epithelial cells. They seal the membranes of neighboring cells together, ensuring that substances must pass through the cells (transcellular transport) rather than leaking between them (paracellular transport).
2. Gap Junctions: These are communicating junctions. They consist of protein channels (connexons) that connect the cytoplasm of adjacent cells. This allows for the rapid transfer of ions, small molecules, and chemical signals directly from one cell to another, facilitating coordinated cellular activities.
3. Adhering Junctions: These junctions (such as desmosomes) perform a cementing function to keep neighboring cells physically anchored together, providing mechanical stability to tissues.

The question asks for:
- The junction that helps to stop leakage of substances across a tissue: Tight junctions
- The junction that facilitates communication with neighboring cells via rapid transfer of ions and molecules: Gap junctions

Therefore, the cell junctions are Tight junctions and Gap junctions, respectively.