I didn’t quite follow him because he explained the theory _____that is too abstract for me.
Everyone at the meeting agreed to the suggestion _______ a new bridge _______ built across the river.
_______ you are familiar with the author’s ideas, try reading all the sections as quickly as possible.
— Why does she always ask you for help? — There is no one else _______, is there?
In order to be _______ for Christmas, all these gifts must be mailed immediately.
Two people were killed in the serious car _______ the other day.