______ it would be silly to argue any longer .
_____but he still couldn’t understand the logical connection of the two subjects.
It was not until he came back _____ he knew the police were looking for him.
All her time _______ experiments, she has no time for films.
Some students are now busy preparing for the “Independent Recruitment(自主招生)” contest, in hopes of getting a “Pass” card at their first _______.
While income worry is _______ rather common problem of the aged, loneliness is another problem that _______ aged parents may face.