Experts have been warning _____ of the health risks caused by passive smoking

Did any signs come up before the earthquake? —YesUnusual things all those daysFor example, a number of animals got out their homes

There was___________ interview with Yao Ming on CCTV-5 yesterday evening. But it was a pity that I missed ___________ beginning.

_____ seemed selfish of him not to share his dictionary with others. But you shouldn’t have blamed him for this because he needed his dictionary to finish his paper then.

16-year-old students in England should understandfifteen _______ words.