The practice of hanging clothes across the street is a common_____in many parts of the city.

Health problems are closely connected with bad eating habits and a _______ of exercise.

To save some of the human languages before they are forgotten, the students in our school started a discussion “Save Our ________”

In this experiment, the famous professor showed three different____ to the study of physics．

In Scandinavian countries it is common ____ for the husband to stay at home to look after the baby.

More than one _______ the people heart and soul.

I bought a vase of the Ming dynasty at such a low price at the Sunday market. It was really a nice __________.

Children need friends ______ their own age to play with.

The ____________ shoes were covered with mud, so I asked them to take them off before they got into __________ car.

The World Health Organization gave a warning to the public without any ______when the virus of H1N1 hit Mexico in April, 2009.