so / because

She is tired __________ she has walked for seven miles.

She has a lot of money _______ she can buy that expensive coat.

The weather is hot _______ the children are swimming now.

We didn't go to their party _______ they didn't invite us.

We are too busy _______ we can't go the cinema today.

It was cold _______ I shut the window.

She doesn't like Andy ______ he isn't honest and kind.

It was raining ________ I took a taxi.

The water wasn't clean _______we didn't swim.

We walked home _______ there were no more buses.