Нужно докончить вопросительные предложения. например: he is responsible for music, he is responsible for music , isn't he? 1 they were happy to get the invitation letter, 2 yesterday your friends went to the cinema, 3 the group of students won't stay in the hotel, 4his collection of stamps was the best, 5 the head teacher didn't write the letter, 6 we can arrange a date and time right now,

1 They were happy to get the invitation letter,  weren't they...? 2 Yesterday your friends went to the cinema, ..didn't they.?
3 The group of students won't stay in the hotel, ..will they.? 4His collection of stamps was the best, .wasn't it..? 5 The Head Teacher didn't write the letter, .did he (she)..? 6 We can arrange a date and time right now, .can't we..?