XI. Read the article and choose a word from the box to fill in each gap.

1. tested

2. by

3. during

4. could

5. those

6. concentrate

7. improved

8. that

9. how

10. teaching

XII. Rewrite the sentences.

1. Unless the weather improves, the garden party won't take place.

2. He plays this piece of music more beautifully than anybody does.

3. Because it rained heavily, we couldn't keep on working in the garden.

4. We began donating books and clothes ten years ago.

5. Our garden has different kinds of plants.

6. I am going to visit Mui Ne this summer.

7. Why don't we go to the city centre by minibus?

8. It is beneficial to work in groups.

9. He spent almost a month finding out information for his travel book.

10. I am interested in this piece of music.