Ex 1 

1 but, or

2 and  put

3 or, and

4 and, because

EX 2 

1 by the time

2 until

3 after

4 when 

5 before

6 while

EX 3

1 although he's tired he can't sleep.

2 although it is expensive I am going to by it.

3 although she works Hurd she doesn't earn much money. 

4 although Dave has a car he prefers cycling. 

5 although we play badly we won. 

6 although she borrowed my pen she didn't say thank you. 

Although I recognize her I couldn't remember her name.