The key answer of exercise 5

a)

oh; double; double; oh; oh

b)

0766 I 311 I 4020

c)

1. oh seven double nine six | oh seven two | five three one
2. oh eight three double five | eight four two | seven oh six
3. eight one oh one three | double oh five | four nine two
4. double four seven eight | oh five one | three four nine

d)

• Sam → nine two four oh | four seven three
• Ahmed → five eight two three | oh three one
• Nina → seven double eight six | three oh one
• Chen → three double six two | one four nine
• Simon → oh four six double three | seven three | double nine one two
• Fatima → oh eight seven oh one | six four two | five one three
• Yuko → double oh double four two | eight one six | nine double three
• Penny → double oh two eight five | nine double five | four two seven