1."We don't open the laboratory today " Mr Minh said.

⇒  Mr .minh said that he didn't open the laboratory that day.

2. "The film will begin at seven o'clock" they told me.

⇒ They told me that the film would begin at seven o'clock

3. An earthquake destroyed many houses yesterday

⇒  Many houses were destroyed by an earthquake

 4.'Have you been to an English speaking country?'He asked us
⇒  He asked me if I had been to an English speaking country 

5. They provided food then cleaned up the debris.

⇒ After they provided food,they cleaned up the debris

1.Mr.Minh said thay he didn't open the laboratory that day.

2.They told me that the film would begin at seven o'clock.

3.Many houses were destroyed by an earthquake yesterday.

4.He wondered if I had been to an English speaking country.

5.After providing food, they cleared up the debris.

$Answered$ $by$ $Mai$ $Chi$$.$