9.What is the name of that book by Mark Twain 10.Why didn't he go to school 11.How long has he worked in that firm 12.What did Nam do yesterday 13.How often does she play badminton 14.When did you recieve your letter 15.What is she going to do tonight 16.When has he been the principal of the school 17.When does she go to school 18.Where did you meet your old teacher yesterday III 2.why (for more...festival) 3. When(on the...month) 4.how long(for...years) 5.how often(every year) 6.how(in a ...way) 7.where(around...square) 8.why (to attend tomorrowland) 9.when(between... february) 10.how(with...enthusiasm)