---What’s ______population of China?---China has_____ population of 1.3 billion.
It’s well known that good relationship between two countries __________ the development of mutual culture and economy.
It is proposed that another meeting _______ to discuss how to give more support to the underdeveloped area.
. She made a promise _______ anyone could save her life, she would give him all her wealth.
With all the family members ______ on vacation without him, the boy felt extremely lonely and afraid.
Why so many youths are _____ on playing computer games often puzzles us a lot.