I didn't know many people in the party but I had a very good time. => I had a very good time at the party ___________.
I didn't know many people in the party but I had a very good time.
=> I had a very good time at the party ___________.
Đáp án: I had a very good time at the party although I didn't know many people.
Giải thích: Although + S + V: mặc dù
Dịch: Tôi đã có một khoảng thời gian rất vui vẻ tại bữa tiệc mặc dù tôi không biết nhiều người.