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I/
1. She said to me that if she had any money, she'd buy me a drink.
2. He said that if he caught the plane, he would be home by five.
3. My mother said I should stay in bed if I felt unwell.
4. Tom said that if he'd had his mobile the day before, he could have contacted me.
5. She said to her brother that if she were him, she'd stop smoking.
II/
1. C /əʊ/ còn lại /ɒ/
2. B
3. A /u:/ còn lại /aʊ/
4. D
5. A /ai/ còn lại /i/
6. D
III/
1. D
2. C : tiền vốn
3. C : dân số
4. A : kế hoạch hóa gia đình
5. A
