Все просто.И совсем немного, хотя иначе на первый взгляд.
Помогите вставить нужные слова/словосочетания в предложения.

1 had translated 2 is 3 were discussing 4 stops 5 is it important 6 will be reading 7 has been 8 had spent 9 watched 10 meet 11 will be held 12 had she been waiting 13 is it necessary 14 has been looking 15 have known