Tom shut everybody out of the study ___ he could prepare for the coming exam. 

 To show our respect, we usually have to take our gloves off ______ we are to shake hands with.

_________ difficult and challenging the task may be, we must finish it on time, because there is a possibility _________we’ll be fired if we can’t fulfill the task on time． 

We do jobs_____they need to be done and that could be early in the morning or late at night. 

_______these coins are of different shapes, sizes and colors, they all date back to a long, long time ago.