—I’m terribly sorry to have given you so much trouble.— ______
There may be something wrong with her ______,she can' t see things clearly.
The room is too small, there' s no enough ________for another desk.
He has searched the ________ or 2 hours for the information about Yang Liwei.
_________ mother is a worker.
At that time, he was studying in_______ university. And it was a famous one.