31. －A number of volunteers ____ willing to work in 2016 Rio Olympic Games this year.－Yes, it’s reported that the number is getting ____.

He failed the midterm examination and only then ________how much time he had wasted.

does your plane take off—– At 3:00 p.m. tomorrow, I’ve justcalled the airport to ____it.

Can you tell me how the accident came _____? — The road accident resulted _____ foggy weather.

The result is not the same _____ they had expected, _____ was rather disappointing.