I would say sad, because that is how I interpreted it.
The answer is C. he. it sounds wrong, but technically that is correct.
Answer: The second one
Explanation: There is a correct pause after work and reminder. If there is no comma the sentence sounds bunched up.
Answer:
Because it is coloured red and is the only planet which is red and dusty .
Also because iron minerals in the Martian soil oxide, or rust , causing the atmosphere and soil look red
Answer:
Your answers are:
She is a useful member of our team.
Fan is hanging on (the) ceiling.
Hope this helps
Sky