1. In the future, there will be no forests left if we keep () trees.

    to cut down

    cutting down

2. Some countries in Europe have offered () food to the area affected by the tsunami.

    to send

    sending

3. They agreed () the charity with their work.

    to help

    helping

4. She enjoys () mystery books.

    to read

    reading

5. Some of the richest countries offered () but they never did so.

    to help

    helping

6. He can't stand () about the existence of starving people.

    to think

    thinking

7. John finished () his community job at noon.

    to do

    doing

8. The school principal is considering () recycled paper for next course.

    to buy

    buying

9. I hope () my family inthe summer.

    to see

    seeing

10. We plan () an average of five hours during the following week.

    to drive

    driving