Что надо вставлять . 1 They were happy to get the invitation letter,...? 2 Yesterday your friends went to the cinema,

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? 4. His collection of stamps was the best, wasn’t it? 5. The Head Teacher didn\'t write the letter, did he?