I was ashamed _________ lied to my mother.
It’s well known that good relationship between two countries __________ the development of mutual culture and economy.
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.
_______ you feel exhausted after the long tiring journey, you may as well take a good rest at home.