Дополните предложения, выбрав необходимые для этого сочетания слов. 23. why to get this book? 1) it was difficult 2) was difficult 3) was it difficult 4) difficult 24. how many exams this year? 1) have you taken 2) you took 3) you have taken 4) did you take 25. what to do now? 1) it is necessary 2) is it necessary 3) necessary 4) is necessary