Here is a link to a Kahoot on For and Since: Since or for by Missfernandazamora.  

(There is another Kahoot on For and Since that I found here, but be careful on this second one because number 7 has the wrong answer.  You may want to skip number 7 if you use it.)

In my class, I used this to supplement Unit 13 Vocabulary from Business Result: Pre-Intermediate.