Do you know the girl _________ is singing in the classroom

It is said that visitors to Shanghai World Expo will be impressed by the _________ designs.

A good rest between classes______ recover brain power to its best and make us perform better in class later.

It was in the small house _____ was built with stones by his father ________ he spent his childhood.

Some people think they are poorer justbecause they are not as______ as other people.