Here I post some websites where you can practice the first and second conditional.

http://www.esl-lounge.com/student/grammar/3g18-first-second-conditional-exercise.php

http://www.perfect-english-grammar.com/second-conditional-exercise-1.html

http://eslgamesworld.com/members/games/ClassroomGames/Billionaire/Conditionals%20Billionaire%20Game/index.html?zoom_highlight=can+questions