Please call my secretary to arrange a meeting this afternoon,or __________ it is convenient to you.
— Remember the first time we met, Jim? — Of course I do. You _______ in the library.
_______ has recently been done to provide more buses for the people, a shortage of public vehicles remains a serious problem.
There are many other examples _______ the development of Chinese writing.
Listen! His family must be quarrelling, _______?
More than one _______ the people heart and soul.