I often have conversation with John over _____ phone, but keep in touch with Tom by writing _____ letters.
Knowledge is the food of thought ________,as long as it is put in our brain,we will grow wiser.
The number of the employees has grown from 1,000 to 1,200.This means it has risen ________ 20 percent.
—What do you want to do ________ those old boxes?—To put things in when I move to the new flat.
His best-known painting that is ________ all praise will be on show in the National Gallery early next month.
Wuhan and Chongqing are among the most important cities in China ________ their size and population.