I/
1/a
2/the
3/a-the
4/the-the
5/the
6/the
7/a-the-the
8/the-the
9/the
10/the-the
11/the-the
12/the-the-∅
13/The-the
14/∅-the
15/∅-the
16/The-∅
17/∅-∅
18/the
19/the
20/the-the-∅
II/
1b 2b 3d 4a 5c 6a 7c 8b 9d 10d 11b 12b 13c 14b 15b 16a 17a 18a 19b 20d
III/
1b 2a 3b 4c 5a
IV/
1d 2b 3a 4c 5c 6a 7b 8d 9c 10a
V/
1/I wish I had time to visit my old friends
2/If my friend waters the tree often,it woudn't had die.
3/My sister has been learning English for 5 years
4/The crops weren't good because there was a storm
5/The woman who's talking to the teacher is Minh's mother
6/If you don't work hard,you won't pass your exam
7/Mr Brown whose team had lost,looksvery sad