In western culture,21 was the age________ young people traditionally received a key to their parents’ door, as a symbol of entering adulthood.
There was _____ time ______ Irap was one of the strongest countries in the world.
The old man,_______ abroad for 20 years, is on the way back to his mother land.
With his lips still _______ ,he couldn’t say a word.
The purpose of technology is to make it easier ,______ it more difficult.
The meeting __ tomorrow will be of great importance. All of us should attend it.