Many people know Zhang Bichen in the Voice of China(中国好声音). She is my _______ because she is really good at singing.

lastic pollution ______in most public areas, it is hard______.

I learned a little Russian _____ Iwas at middle school

One of our rules is that every teacherwear school uniform while attending the school flag-rising ceremony.

__ I am concerned, I think the project should be held off right now