Unit 17. Modal verbs. Can. Could. Be able to 1.Choose the correct option.
1 Animals can could travel a long way to find food.
2 Most dogs can't couldn't see the difference between red and green
3 Ofen during World Wars I and II, people can't/ were not able to find survivors.
4 However, dogs will be ablel were able to find them
5 In the future, scientists can) will be able to make robots to replace people in
dangerous situations.

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