A Complete sentences 1-8 with the Present Perfect or the Past Perfect form of the verbs in the box.


( see, experience, climb, use, fly, disappear, explore, study )


1 I ..................caves with my bother for over ten years.

2. John .....,......endangered species before he was finally able to visit some of their natural habitats.

3. Billy ............... never ...........a power station.

4 This is the fifth year we................
solar power at home.

5 After they...............
the mountain, they finally reached the glacier.

6 Our planet................
climate change for some years now.

7 Before we continued our trip from Vienna to Warsaw, we.....,.............
from New York to Vienna.

8 A number of rainforests............
already............
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