I ____ Maria for the first time at the Heart-to-Heart Charity Office.

We ____ the roof for Mrs. Smith, an elderly childless woman, when it ____ with rain.

When we were on a voluntary tour, we ___ to public places to collect rubbish every day.

It is ____ that all the students in class 1OA choose to do a project on ‘Helping the needy’.

Volunteers become well ____ of the problems facing the world.

The phone was engaged when I called. Who ____ to?

Mark the letter A, B, C, or D to indicate the correct answer to each of the following questions.

Last Sunday, our volunteer team ____ a lot of food packages to homeless people in the flood-hit region.