17 Although it was cold, we went swimming
18 Although the man was old , he could lift such a heavy box
19 In spite of his illness, minh still came to the meeting
20 Although the rain was heavy, we decided to go to see the match 

17/ Although it was cold, we went swimming.
18/ Although the man was old , he could lift such a heavy box.
19/ In spite of his illness, minh still came to the meeting.
20 /Although the rain was heavy, we decided to go to see the match.