1- Governments must do something about pollution _____ it's too late. a- after b- across c- before d- from.
2- There are very few tigers int he world; it is a(n) _____ species. a- endangered b- conservation c- rebewable d- natural.
3- The natural _____ of this species of turtle is the Aegean Sea. a- balance b- habitat c- survival d- resource.
4- _____ energy comes from wind, water and other natural sources. a- Fossil b- Solar c- Renewable d- Natural.
5- Come away form the edge Someone fell off that _____ last week! a- cave b- coast c- rainforest d- cliff.
6- The _____ is disappearing very quickly. We have to do something to stop it. a- glaciers b- rainforest c- stream d- valley.
7- The teenagers ran _____ one end of the beach to the other. a- between b- across c- from d- for.
8- It is now possible to turn old cooking oil _____ fuel for cars. a- to b- on c- up d- into.
9- I can't talk right now. I'm very busy _____ the moment. a- for b- at c- from d- around.
10- _____ months of hard work, we've finally managed to clean up the city's parks. a- Between b- Across c- Over d- After.
11- He was a loving husband and father, and he was very proud _____his family a- with b- of c- to d- on.
12_ Don't worry about what others do. Concentrate _____ your work and do it well. a- to b- with c- of d- on.
13- I'm not angry _____ you, I'm just disappointed. a- to b- with c- of d- on.
14- The first exercise is similar _____ the last one but it's a bit harder. a- to b- with c- of d- on.
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