18)My sister who lives in San Francisco<u><em>, </em></u> is a chemist!
19)My sister who is a doctor , lives in London!
(Kevin and Denise thinks) is incorrect. The correct pronunciation would be (Kevin and Denise <u>think) </u>without the plural form.
Answer:
Solar eclipses result from the Moon blocking the Sun relative to the Earth; thus Earth, Moon and Sun all lie on a line. Lunar eclipses work the same way in a different order: Moon, Earth and Sun all on a line.