When Sandra walked out of the meeting, she didn't say goodbye to anyone.
When Sandra walked out of the meeting, she didn't say goodbye to anyone. (without)
=> Sandra left _____________________ goodbye to anyone.
Đáp án: Sandra left the meeting without goodbye to anyone.
Giải thích: without + Ving: mà không làm gì
Dịch: Sandra rời cuộc họp mà không chào tạm biệt ai.