although, but, so, because

She wanted to go on holiday ___she was short of money.

I did not understand how did it work___I said nothing.

The last bus has gone _____ we had to walk home.

You'd better take an umbrella _____ it is going to rain.

The camera is expensive ____ it is very good in quality.

____he is a good ski instructor, he cannot go skiing anymore ____he hurted his leg seriously few years ago.

He spent only few hours to study the test ____ he failed.

He failed the test ___he had to do it again.

They offered him the job ___ he turned it down.

______it rains outside____ I still walk my dog in the park.

Betty woke up late this morning _____she went to school by taxi.