Add a correct question tag to each sentence

----- Nội dung dịch tự động từ ảnh -----
21. This won't take long..
22. She doesn't believe you..
23. It didn't matter very much.........
?
24. Mary couldn't leave the children alone..
25. You aren't doing anything tonight.........
26. You wouldn't mind helping me with this...............?
27. George hadn't been there before...
28. The children weren't surprised..
29. You wouldn't like another drink........
30. Tom doesn't have to go to lectures..
31. Bill hasn't got a car..
.....?
32. Bill couldn't have prevented it...............?
33. I needn't wait any longer.....
.?
34. There weren't any mosquitoes...
35. The fire wasn't started deliberately
36. The children can read French.........
37. He's ten years old..
38. Bill came on a bicycle...
39. The Smiths have got two cars..
40. Your grandfather was a millionaire..
...?
.?
.....?
...?
.?
.....?
.....?
.......?
..?
.....?
?