Though many extra trains and buses are used to carry passengers, traffic tools are still ________ needed during the Spring Festival.

I want to ring him＿＿＿to know the reason why he rang＿＿＿while I was speaking yesterday. 

 I won’t buy the house, which was too expensive and too big. ______, I’d grown fond of our little rented house.

The conference was _______ fixed for the 10th, August, but later the unexpected landslide(泥石流) in Zhouqu in Gansu province, made us put it off.

This is only a solution that can be adopted to solve the problem       , so you have to find a better way.