It is such a difficult problem _______ no one can work out.

Why not ______ your teacher for help when you can’t finish ______ the story by yourself.

His father seldom goes shopping,_______?

Mike hardly puts up his hand in class, ________ he— ________, he is one of the most active students in our class.

They then heard a woman’s voice coming from the damaged ship. _____the ship, they saw that a woman was trying to get out of the broken window.