The key answer of exercise 4

a)

1. D
2. A
3. E
4. F
5. C
6. B

b)

1. F
2. T
3. F
4. T
5. T
6. F

c)

1. You should stand up and walk around.
2. Having good relationships makes you happy.
3. Things like answering a difficult email and making a dentist's appointment.
4. You will feel happy now because you will look forward to the special thing.
5. You will feel good / better.
6. When you smile, you feel better.

d)

1. exercise
2. relationships
3. touch
4. cross
5. forward