Environment-friendly Olympics requires Beijing to improve its environment, _______ turning it into an ecology-friendly city.
Wang Lin failed to be admitted by Hong Kong University last year,and only then________the importance of English.
—What happened over there? —They argued________the waiter________the price of the meal.
Alice, together with two boys,____ for having broken the rule.
She made me promise not to ________ where it was hidden.
It has been five years since this party____. Many people wonder whether it will stay on.