CEF Level: Pre-Intermediate
1 Exclamations, Part 1                  5 Exclamations, Part 5
2 Exclamations, Part 2                  6 Exclamations, Part 6
3 Exclamations, Part 3                  7 Exclamations, Part 7
4 Exclamations, Part 4                  8 Exclamations, Part 8

CEF Level: Intermediate
1 Let's, Part 1                         6 Let us
2 Let's, Part 2                         7 Let there be
3 Let's not, Part 1                     8 Let him / Let them, Part 1
4 Let's not, Part 2                     9 Let him / Let them, Part 2
5 Let's not, Part 3                     10 Mixed Exercise

CEF Levels: Intermediate / Upper-Intermediate
1 Complex Constructions, Part 1         3 Yes and No, Part 1
2 Complex Constructions, Part 2         4 Yes and No, Part 2