Review Unit 18, 20, 21, 22 : Pl, St, Sw, Tr, Wh
<p align="center" style="text-align:center; margin-bottom:11px"><span style="font-size:11pt"><span style="line-height:107%"><span style="font-family:Calibri,sans-serif"><b><span lang="VI" style="font-size:13.0pt"><span style="line-height:107%"><span style="font-family:"Times New Roman",serif">Review Unit 18, 20, 21, 22 : Pl, St, Sw, Tr, Wh</span></span></span></b></span></span></span>&l