If I want to use the modal verb "can" in the 13th, you need to omit "to" otherwise "be able to" - You will correct me if I'm wrong. In the 4th, I have the same problem but I'm sure the second space is "she remembers" - I still receive an error answer.
Congratulations for the worksheet. It has been very useful for my students.
You should edit "What happens?" in number 9 in the answers and in the 13th (not remember). These are our suggestions. Thanks again!
THIS IS A WONDERFUL WORKSHEET. BRAVO!
You need to edit number 4 and number 13 as the answers are incorrect.