Question

1. _________ problems are hard to solve and becoming more and more serious. ( environment ) 
2. They left a lot of garbage on the ground after their _______________ ( refresh )
3. After his _________ , Mr.Hammod returned to his home village to do the gardening. ( retire )
4. They are walking along a _________ path. ( rock )
5. The teacher stressed the need for regular ____________ ( attend )

Answer 1

1Environmental

2refreshed

3retired

4rock

5attendtion

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