Question

1. Unfortunately the carbon dioxide ……………..(increase) last year.
2. Gases …………………………..(change) the atmosphere in 2019.
3. What ……………………( men / give) to the planet ?
4. Men ………………….(save) sea animals in the past ten years.
5. Animals …………………… (not – find ) much oxygen in India during 2015.
6. What ………………….( factories /pollute) in the Earth?
7. Trees ………………….(return) oxygen to mankind in the 20th century.
8. What time ……………….( sun / appear ) on the horizon?
9. I ………………… (see) the video about the ‘Greenhouse Effect’ last week.
10. The student …………………. (forget) his homework on the desk yesterday.
11. Soldiers ………………………( find) dead dogs all over the city during the 2nd World War.

Answer 1

1. has increased
2. changed
3. have men given
4. men have saved
5. haven’t find
6. have factories polluted
7. returned
8. has sun appeared
9. saw
10. forgot
11. found