Viết lại câu, chuyển đổi câu

15. They expected more than two million Muslim pilgrims from all over the world headed to Mecca last year.
It ____________
More ___________
16. People believe that many more people will die of skin cancer over the next ten years.
It ___________
Many_________
17. People are thinking that drugs were very dangerous.
It _________
That drugs____________
18. People have reported that Bitexco Tower is the tallest skyscraper in Vietnam.
It ____________
Bitexco_______________
19.The boy looks thin but he is very strong.
In spite of............................
20.No one can solve the problem.
This problem....................