Choose the correct answer.

How long ______ interested in environmental issues? It seems that you have done your research.

Choose the correct answer.

Pioneers in science are often the ones who ______ other people to study and develop their discoveries.

Choose the correct answer.

This charity provides support ______ underprivileged people.

Choose the correct answer.

Building necessary ______ such as hospitals, schools and parks is important.

Choose the correct answer.

Many people who ______ think that they are very fortunate to live the way they do and want to give something back to society.

Choose the correct answer.

Their children ______ lots of new friends since they ______ to that town.

Choose the correct answer.

Doing volunteer work is ______. It makes the world a better place.

Choose the correct answer.

Volunteer work helps young people know their strong and weak points before they enter the ______.