linking words

Choose the most appropriate linking word for each gap.

Liz stayed at home she was very tired.
Liz expected an important call, she didn't join the others, stayed at the office.
I like coffee, I don't like tea.
She couldn't join them she had promised her parents to stay at home.
she didn't have much money, she bought a present for her brother.
he didn't need a new TV set, he bought one.
Liz went to the bank she wanted to cash some traveller's cheques.
She didn't have much money, she bought an expensive ticket.
he was very tired, he went on working.