"To have" in Past Simple and modal verb Could

He ______ walk when he was 1 year old.

The children ______ do that task. It was very difficult for them.

We _____ open the door, because it was locked from the inside.

The Ancient Egyptians __________ brick houses.

Steve Jobs was a computer programmer and __________ his own company.

The Ancient Egyptians __________ fresh water from the River Nile.

Melissa _______ swim at the age of 7. She was afraid of water.

They ______ build huge pyramids.

Only wealthy boys _______ go to school in Ancient Egypt.

Ancient Romans ________ spoons,so they _______ eat with their fingers.