Пожалуйста очень прошу помогите 243

Ex. 243 1)      were / was writing / was reading 2)      didn’t tell / had received 3)      asked / knew /lived 4)      said / didn’t know 5)      asked / could 6)      said/ had given 7)      asked / had put 8)      was sitting / thinking  / opened/ hadn’t seen/ entered 9)      came / were having / was / saw 10)   saw / was leaving 11)   hadn’t seen / met 12)   had left /had 13)   felt / wanted 14)   thought/ had already gone 15)   found/was talking/were standing 16)   was speaking / had never heard before 17)   told / had learnt 18)   entered/took/ went