The questions 1, 2, and 5 are already matched in correct order.
Explanation:
1. Meter - standard metric unit of length.
2. hypothesis - a proposed explanation for a scientific problem.
3. mass - amount of matter in an object.
4. liter - standard unit of volume.
5. control - a quantity in an experiment that remains unchanged or constant.
6. meniscus - the curved top surface of a liquid column.