OS-3 Listening WB p.18

1) Exercise 1 p. 18

2) Exercise 1 p. 18

3) Exercise 1 p. 18

4) Exercise 1 p. 18

5) Exercise 1 p. 18

1) Exercise 2 p. 18

2) Exercise 2 p. 18

3) Exercise 2 p. 18

4) Exercise 2 p. 18

1) Exercise 3 p. 18

2) Exercise 3 p. 18

3) Exercise 3 p. 18

4) Exercise 3 p. 18