ass doors have taken the place of thewooden ones at the entrance,_____ in the natural light during the day

Was Mr Jones sent into prison?—No, _____was telling a lie.

He kept yawning in class this morning. That is _____ he stayed up late doing his homework last night.

My English teacher is very ______ because he always explains problems over and over again.

We are just trying to reach a point ______ both sides will sit down together and talk.