At times, worrying is a normal________ to a difficult event or situation—a loved one being_______ in an accident, for example.

 The doctors must get there in half an hour. There should be no____ in sending the blood to the dying girl .

There is an obvious __________ between the cultures of the West and East.

After our government launched a (n)       to popularize Chinese language worldwide, lots of Confucius colleges have appeared in foreign universities.

The _________ on her face showed that she was in low spirits.