I don’t know how to be good with my family problem. Could you give me some ______ .

Living things are dying out quickly. Let’s ask ____ destroying them in the past years.

This novel was concerned______the Second World War，while most teenagers are more concerned______the hero’s love story.

Mother asked me ______ computer games before finishing my homework.

quality of the city’s air continues to give rise to ______, the residents are encouraged to set off fewer fireworks.