c1 : Đảo ngữ các câu sau : 1. He got down to writing the letter as soon as he returned 2. She just had time to put up her umbrella before the rain came down in torrents 3. The only way to elimate world terrorism is by united opposition. 4. The workers only called off the strike after a new pay offer. 5. You are the best friend I can find in this world. 6. There was no precedent for the king's resignation. 7. I write to him almost everyday. 8. Children can learn a lot about how to behave in a situation like this. 9. You will find so many happy people nowhere else. 10. It's seldom wise to disregard the advice that he gives. 11. They have invited us to their home not once.