Difficulties and hardships have ________ the best character of the young geologist.

The meeting was _____ when the chairman fell ill.

_______ is known to the world, the Chinese in many places _______ the old tradition.

----Has the teacher who was hurt in the earthquake been taken good care of?----Ever since she was sent to the hospital, she has never been _______.

---Jack can't concentrate on his study recently． --- Yes, that might ____ why he did so badly in the last test．