Lawrence Craven, a doctor from the USA, is the author of several published reports, one of _____ introduced the idea in 1953 _____ aspirin could reduce the risk of heart attacks.
She tried her best to _____ the life there, but failed to make any _____.
Chinese economy suffered a great loss from the May12 earthquake _____ the snow and ice storm in February, 2008. Which of the following is NOT true?
All those _____ about the poor children should be _____.
After graduation, he _____ the challenge, which _____ all his spare time.
We can make some adjustments __________ the reactions of the customers.