下列各句中，没有语病的一句是

Smile to the world, ________ the world will smile back to you.

Yesterday, Jane walked away from the discussion. Otherwise, she ______something she would regret later.

lecture, the professor referred to the belief,in contrast to all other countries, ______ the elderly are wise, ______ isparticularly dominant in the Chinese culture．

If you are going to stay in the United States for longer than a(n) ______ visit, you may be interested in learning more about its people and culture.