Fill the gaps with age, era, period, spell, phase or stage.

1. The Minister said that before the new law came into force there would be a period of six months when people could hand in firearms without being prosecuted.
2. The last two decades of the twentieth century will be seen by historians as the beginning of the computer .
3. The new university will be built in three , beginning with the opening of the science faculty in 2015.
4. These factories mark the beginning of a new of industrial development for the country.
5. My son went through a of not wanting to go to school when he was about nine or ten.
6. We had a very cold in February. All the water pipes froze up.