Mother went shopping; ______, I cleaned the house.

Traffic is bad, ________ in the city center during the rush hours.

He often dreams of going_____.

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.

Many people think they have to spend a lot of money to keep healthy. Leading a healthy lifestyle doesn't have to cost much,         .