Whether ways will be found to stop pullution or not is just ________ worries the public

You are smoking a lot .— Yes. It’s not good for my health. Iwill try to ______ the hobby.

Tsinghua University, ______ in 1911, is home a great number of outstanding figures

两个句子不都有通假字的一项是（ ）

Could you let me know ________ yesterday —Because the traffic was heavy .