Хоть какое из этих упражнений. Необходимы все

1. She never heard
2.I just read your letter
3.He finished his homework at three o'clock in the evening
4.The toothache disappeared after I took the medication5.The doctor will come to the house by 9 p.m.
6.I read this book by next Friday
7.He still has not written the letter9.
8.She went for a walk after lunch
9.They won't come by 6 o'clock the following Monday
Если что, задание 7