Comrade Li Dazhao, _____ librarian of Beijing University, was one of the founders of the Chinese Communist Party.
She felt_______at the_______situation.
Here is so difficult a problem_______none of us can solve.
Is this museum _______ we visited last week?
It is not a serious illness. So I guess she will_______soon.
We never dared to ask him a question, _______ ?