làm hết nhé
III. Rewrite each sentence, beginning as shown
21. If you had given it in on time, you would have got a high mark.
=> Had 
22. If you wish to take advantage of the offer, kindly tick the box on your order form.
=> Should
23. The only thing that makes this job worthwhile is the money.
=> Were  
24. It’s my opinion that you should take more exercises.
=> If I 
25. Without his wife’s constant support, he would never have achieved his ambition. 
=> If he 
26. Follow this instruction carefully and you won’t have any problem.
=> As long as 
27. But for his presence of mind there might have been a serious accident.
=>If it 
28. If you work on Saturday morning, I’ll give you the day off.
=> On 
29. If you agree to share the expenses, you will be welcome to stay with us.
=> So long as 
30. You can borrow my bike if you bring it back on time.
=> Providing