When Marx was in London, he  __   read at the library for hours.

– Could I use your mobile phone? I have to call my mom for the coming class meeting. --Yes, of course you _____________.

This printer is of good quality. If it ________ break down within the first year, we would repair it at our expense.

--The man in a black suit _______ be our youth worker. -- I’m sure it _____ be him. I saw him in the laboratory building some minutes ago.            

— _ I use your eraser, Rose?— Sure. Here you are.