No more than= only OR less than?

Do we have to add a "the" before "countryside"?

If a door or wall reduces the noise from another place, or prevents the noise from getting in, how do you describe it? Is there any adjectives to describe it?

At the weekends, i play computer games if I'm not busy studying. Can I replace the "if" with "when"?

Is there any specific English word for this meaning? Sometimes i feel i got misundertood, so i would feel really bad. Is there any English word to describe this feeling? Can i say "i feel wronged"?

What does it mean by "a sense of perspective"

if you ___ stop smoking, you can only expect to have a bad cough. 这里应该选 won't还是don't?

It is just as possible "People are often mistaken in thinking that those with high IQs always have high EQs as well. This Association can exist，but it is just as possible for someone with the low IQ to have a high EQ or someone with high IQ to have a low EQ." I don't know what "it is just as possoble……" means, and how I can use it.

They got nothing on you Do you know the song "they got nothing on you"? What does the name of the song mean?