1. It took him 2 hours writing the letter.

2. He asked Minh what he would do the next day.

3. Oil has been found in the Antarctic.

4. That bicycle is cheaper than this one.

5. I suggest putting the garbage bins around the schoolyard.

6. The planet which is closest to the earth is venus.

7. An ambulance has just been sent to the school.

8. She asked me what aspect of learning english i found most difficult.

9. Minh hasn't written to his pen pal for 10 months.

10. The questions can't be answered.

 1. He wrote the letter in two hours.->  It took him 2 hours to write the letter
  2. “What will you do tomorrow , Minh?”He asked 
     ->  He asked Minh what he would do the next day 
3. They have found oil in the Antarctic.-> Oil has been found in the Antarctic
  4. This bicycle is more expensive than that one.->That bicycle is cheaper than this one
5. Let’s put the garbage bins around the schoolyard.         
 => I suggest putting the garbage.... .
6. The planet is Venus. The planet is closest to the Earth.  
=> The planet which is closet... is Venus
7. They have just sent an ambulance to the school.          
  =>  An ambulance has just been sent to the school
8. "What aspect of learning English do you find most difficult?" she asked me. 
 => She asked me what aspect of learning English i found most difficult
9. Minh last wrote to his pen pal ten months ago.       
 =>  Minh hasn't written to his pen pal for 10 months
10. No one can answer the questions.=> The questions can't be answered by anyone