I have an appointment _______ Dr.Brown,but I need to change it.
―These necklaces are fantastic! Jack, what about _______ with red stones?―Mmm, I don’t know, but why not try _______ on?
The minute I opened the window, _______.
He was working quietly, with all his attention _______ on the task.
The earthquake in Yushu _______ roughly one month before the second anniversary of the earthquake in Wenchuan.
We need to “spread a little happiness”, _______ the song goes.