Answer:
obstacles because read the book carefully please mark me as brainpower
Because the x was this and plus that and plus all that other stuff
I think your answer is A.
1)help your parents
2) do your homework that given by your teachers
3) going to the tuition class
Answer:Perhaps the mysterious Martian methane, and its strange fluctuations, are part of that story
Explanation: I hope this will helps you
