I. Make up the questions:
1. types/of/problems/What/ecological problems /we/do/have?
2. are/seas/Why/the/danger/in?
3. “greenhouse effect”/does/the/What/mean/word?
II. Make up the sentences with the words:
1 .Protect
2. recycle
3. litter
4. rare plants and animals
5. reduce
6. save
2. I _listened__ to music with friends.
3. We _studied_ hard for the exam. So, we _answered__all the questions.
4. ‘’ _Did_ you _finish___ your homework?’’ ‘’No, I __didn't.’’
5. I _waited__ for the school bus but it _ didn't come__.
6. Karen __asked__ for help to finish her homework.
7. __did __ you __ invite__ them to your party last week.
8. Yesterday night, somebody __knocked___ at the door. But I ___ didn't open__ it.
9. The students __walked __ down the street with their teachers.
10. Something strange __happened___ last night.
11. Tom __checked___ his answers.
12. The postman __delivered__ the letters.
13. We __lived___ in Madrid three years ago.
14. Helen __didn't study___ for the exam and she __failed__ .