U8B

3. chemical waste material capable of causing death or injury to life
5. A lot of interesting photos _ during the school trip last week. (take)
8. the action of clearing a wide area of trees.
9. The match _ because of the bad weather yesterday. (cancel)
10. the ground under the sea, the ocean floor.
12. a building or group of buildings where sth is being manufactured
15. The classroom _ before the students arrived this morning. (prepare)
17. a boat that's used for fishing
18. a biological community of interacting organisms and their physical environment
19. The invitations _ already _ by the time we got there. (send)
20. This problem _more carefully if we want to find a solution. (study)

1. The new shopping center _ next month in the city center. (open)
2. The new bridge _last year after several months of construction. (complete)
4. The project _ by a group of young engineers at the moment. (develop)
6. The documents _ while the manager was out of the office. (sign)
7. dense forest rich in biodiversity, found typically in tropical areas with heavy rainfall.
11. seriously at risk of extinction.
13. a material made from the skin of an animal by tanning or a similar proces
14. Many important discoveries _ in the 20th century. (make)
16. extremely unpleasant or dangerous.