• Exercises:
1. They say that fish is good for the brain.
It --Fish -
2. People think that we use a small percentage of our brain power.
It ---We
3. They claim that we remember things we hear in our sleep.
We
4. People believe that solving puzzles keeps the brain active.
It -
Solving puzzles -
5. Experts have proved that exercise is good for concentration.
It --
Exercise
6. People say that the exams are disastrous.
It -
Le exam-
7. People know that the sun shines itself