It was at 8 o’clock ________ I went back home last night.
We need to get to the root of the problem______ we can solve it.
Schools should be lively places where individuals are encouraged to ______ to their greatest potential.
Hard work and lack of sleep have _____ her beauty and youth in recent years.
We shall not start the project until it __________ by the committee.
The British team, ______ several attempts to climb Yulong Xueshan, decided to have another try this summer.