A.
1B 2B 3B 4A 5C 6A 7 đáp án bị sai 8B 9D 10A
B. 1.C frightened -> frightening
2.C despite -> despite the fact that
3A is usually swimming -> usually swims
4C used to get sick -> got sick
5D go out of -> went out of
6B have been returned -> have returned
7D to see -> to seeing
8D
9D to sunbath -> sunbathing
10C owned -> own