Hoàn thành câu

If ..........
19. If Kate doesn't keep fit, she will lose her job.
Unless........
20. If he is not hungry, he will not eat breakfast.
Unless.....
21. Some people believed that students need to do regular homework.
It .............
22. Many people know that patience is important for success.
Patience
23. People believe that the weekend was hot.
The weekend .........
24. People know that that the oil price will increase again this year.
The oil price..............
25. They think he will not come tomorrow.
He ......