______ flag-raising ceremony was held at the Golden Bauhinia Square on July 1 to celebrate ______ 17th anniversary of Hong Kong’s return to China.
Charles Babbage is generally considered ______ the first computer.
"Can’t you read?" Mary said ______ to the notice.
Look, they seem _____ about you.
My brother ______singing ______ dancing while I _____ dance _____sing.
Mr. Chen is a teacher and works very hard. _________ his wife.