I:
1. although
2. c
II:
1. will buy
2. am pleased
3. asking
4. have learnt
III:
1. Tet is a festival which occurs in late January or late February
2. Mrs. An is an engineer who lives in HCM City
3. if he has enough money, he will buy a new cả
4. although his leg was broken, he managed to get out of the car