Does anyone use this book? Can someone teach me how to use the checkboxes? I'm confused

Link of the pictures of the book and checkboxes I'm referring to below:

http://imgur.com/gallery/Hzu2nU2

Help very much appreciated, thank you!

submitted by /u/FawkesFeyre
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from Merħba| Languagelearning http://bit.ly/2ShkRSB
via Learn Online English Speaking

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