17. If you ........... (not / focus) during the lecture, you ........ (not / remember) the key points.
don't focus, won't remember
18. You ............. (save) money if you ........... (cook) at home instead of eating out.
will save, cook
19. If I .............. (not/bring) my notes, I ......... (fail) the quiz.
don't bring, will fail
20. The alarm ................ (sound) if you ............ (open) the door without the code.
sounds, open
