Choose the correct answer.

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

Choose the correct answer.

This charity provides support ______ underprivileged people.

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.

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

Choose the correct answer.

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

Choose the correct answer.

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

Choose the correct answer.

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

Choose the correct answer.

It’s 10 o’clock in the morning. Sarah ______ in her room. She ______ her homework.