Viết lại câu

giải hết mới chấm điểm nha
----- Nội dung dịch tự động từ ảnh -----
3. Lisa made a sandwich and then sat on the sofa to watch TV.
(before)
4. We packed our suitcases and then left for the airport. ee
(as soon as)
5. The lecture started. Then I entered the lecture hall.
(when)
6. I hadn't tasted Chinese food before.
(first)
7. That was the only science-fiction book he had read.
(never)