Bài 1 :
1. When
2. what
3. whose
4. why
5. how often
Bài 2 :
1. Why does Rachel stay in bed? - She stays in bed because she is sick.
2. How do/did you go to the office? - I go/went to the office by bicycle.
3. Whose laptop does she carry? - She carries mine.
4. Where does she buy it? - She buys it at Puppy Shop.
Bài 6 :
1. before
2. after
3. although
4. so
5. when
6. although
