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1. To assign a numerical value to the inertia of any given body, we choose as a standard some body whose inertia is arbitrary taken as unity.
2. Oxygen is extremely hard to liberate from a compound.
3. The disintegration of radioactive substances is known to be a spontaneous process.
4. We know the electric cell to consist of two plates of conducting material assembled together and immersed in an electrolyte.
5. Atomic energy is likely to become the main source of power-supply in the years to come.
6. Dilute solutions appear to obey laws exactly analogous to the laws of gases.
7. The difficulties to overcome in the manufacture of synthetic camphor seem to be great.
8. There was a time when lightning proved to be a dangerous problem to be solved.
9. Devices for changing ac into dc are needed to charge storage batteries.
10. The weather is unlikely to change for the better in the coming days.
11. I asked him to inform me about the results of the test.