Please post this letter in the post office nearby, and __________, I will get two tickets in the train station

Look, the old man who is playing _______ guitar is ______ university teacher.

Caroline __________ staying at home, doing nothing at all. So she has made up her mind to find a job for herself.

He didn’t come to school yesterday _______ that he was ill

When he walked __________ my desk, he knocked my books __________ the floor.