_______ you are familiar with the author’s ideas, try reading all the sections as quickly as possible.                                  

You’d better take your coat with you __________ it becomes colder.

_______ we have planned ahead might change when we put it into practice. 

Last night Mr. Crook didn’t come back at the usual time. ______, he met some friends and atayed out unitl midnght.

We had to wait half an hour _______ we already booked a table.