Subordinating Conjunctions: because, although, unless, until

We stayed at home all day ___ it was raining heavily outside.

___ the exam was very difficult, most of the students passed.

You cannot enter the building ___ you have a security pass.

Please wait here ___ the manager is ready to see you.

I didn't buy the shoes ___ they were way too expensive.

We will go for a picnic tomorrow ___ it rains.

He didn't stop working ___ he had finished the entire project.

___ he has lived in London for five years, he still gets lost sometimes.

I’m going to bed early tonight ___ I have a very important meeting tomorrow morning.

You won't improve your English ___ you practice speaking every day.

The restaurant was very crowded, ___ we had a reservation.

They decided to continue the game ___ it was getting very dark.

She will not be able to graduate ___ she passes all her final exams.

I hadn't heard from my sister ___ she called me yesterday evening.

I am wearing a coat ___ it is quite cold today.