Revision of Units 1-4

For those of you who were not there today or left before the end of the lesson:

We will do an exam next Monday. It is the module test (units 1-4) from the textbook, similar to the unit tests I have been giving you to do at home.

By the way, that reminds me that I had to give you the answer key of Unit 3 Test and Unit 4 Test. Here you are!

Unit 3 Test answer key a & b
Unit 4 Test answer key a & b