Sure, here’s a rewritten version of the text:

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EX4: Rewrite

1. "Have you prepared for the test next month?"
→ The teacher asked if I had prepared for the test next month.

2. "Have you been standing there since 2 p.m.?" he asked her.
→ He asked her if she had been standing there since 2 p.m.

3. "Are you still standing there, Mai?" he asked.
→ He asked if she was still standing there, Mai.

4. "Why are you still standing here, Mai?" he asked.
→ He wanted to know why she was still standing there, Mai.

5. "We will wait here until you come back, Sir," they said to him.
→ They said that they would wait there until he came back.

6. "Will you stay in England next year?" Tam's friend asked him.
→ Tam's friend asked if he would stay in England the following year.

7. "What will you do in England next year?" Tam's friend asked.
→ Tam's friend asked what he would do in England the following year.

8. "Do you know my teacher's telephone number, Lan?" said Minh.
→ Minh asked if Lan knew his teacher's telephone number.

9. "What do you know about my new teacher, Linda?" said Ninh.
→ Ninh asked what he knew about her new teacher, Linda.

10. "Will you borrow her bike next time?" said his mother.
→ His mother asked if he would borrow her bike next time.

11. "Did you borrow your friend's bike last week?" said her mother.
→ Her mother asked if she had borrowed her friend's bike the previous week.

12. "Do your parents still live in Hai Phong now?" said Loan to Nam.
→ Loan asked Nam if his parents still lived in Hai Phong.

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Feel free to ask if you need any more revisions!