I can’t find my socks. Where ________ I have dropped them?

-Why ________ it rain at weekends?-Never mind, let’s watch TV at home.

A giant of a man was standing in the doorway. His face was almost completely hidden by a long and untidy hair and a wild beard, but you ______ make out his eyes, shining like black beetles under all the hair.

 – Excuse me, sir. But nobody _____ smoke here in the lift! -- Sorry! I didn’t see the sign. 

According to the school rules, no student __________ go out of the school after eleven o’clock at night without the teacher’s permission.