20.This is the small house less than 15 square meters,under _____ roof lives a large family of three generations.
—I have passed the job interview! —________!
________ we have got everything ready, let’s begin the debate.
Look! Some workers are busy building a monument, one______the national hero
Little John hardly got anything in________ for his kind act, ________ made him unhappy.
That hazy(雾霾)weatherhas hit104 citiesin middle-east China lately makes citizens well aware of ______a terrible problem China is faced with.