Question

4. Switch off the lights before you leave the classroom
5. I knew that she was very tired.
6. We can enter only when the chief guest is seated.
7. You can participate because you are already twelve years old
9. He can complete this work when he goes
home
10. Please collect the books when the bell rings.​

Answer 1

Answer:

metric system is a system of measurement that succeeded the decimalised system based on the metre introduced in France in the 1790s. The historical development of these systems culminated in the definition of the International System of Units (SI), under the oversight of an international standards body.