Clauses of concession, result, reason and purpose

Choose the correct variant. The door was open, ______ we could hear everything.

Choose the correct variant. ______ he is very busy, he is seldom at home.

Choose the correct variant. We packed a lunch, ____ we knew we would soon be hungry.

Choose the correct variant. They went swimming, _______ the coldness of the water.

Choose the correct variant. I enjoy the course, _______ the professor is a good teacher.

Choose the correct variant. They managed to work together, _______ their differences of opinion.

Choose the correct variant. _______ she lost her way twice, she arrived safely.

Choose the correct variant. We have to hurry ____ not to be late.

Choose the correct variant. We recognized him at once, _____ we had not seen him for ages.

Choose the correct variant. I must leave now, _____ I have a great deal of work to do.