I recommend doing some grammar exercises before our test on Unit 1.
Perfect Tenses
http://www.englishpage.com/verbpage/verbs7.htm
http://www.englishpage.com/verbpage/verbs7.htm
http://www.ego4u.com/en/cram-up/grammar/prepersim-preperpro/exercises?ex07
http://www.ego4u.com/en/cram-up/grammar/prepersim-preperpro/tests?test2
Present Tenses
http://www.ego4u.com/en/cram-up/grammar/simpre-prepro
http://www.englishexercises.org/makeagame/viewgame.asp?id=1438#a
http://www.e-ang.pl/test,75,Present_Simple_Present_Continuous.html
http://www.englishpage.com/verbpage/verbs1.htm