Choose the correct forms of the verbs
1. Bosphorus Bridge connected/has connected east and west since 1983
2. Thousands of animals lived/had lived in the valley by the time
3. They built /had built a huge bridge before we came to the village
4. When the man returned home his son has gone/ had gone to bed
5. The flat was very dirty , because nobody has cleaned / had cleaned it for a long time