In fact, smokers know that smoking has a bad ________on their health, but they just can’t stop it.

 Due to the unreasonable individual income ­_______, the gap between the rich and poor has become an outstanding issue.

—Can you help me with this problem?—It's beyond my __________.I didn't work it out, either.

We may lose a lot of support, but that’s the         we’ll have to take.

 Giving up smoking is a slow and painful _______ for him.