Помогите раскрыть скобки Past Simple and Past Perfect. Пожалуйста!!!!

Open the brackets using Past Simple and Past Perfect.
1.He (to read ) an article about the British Monarchy by 3 o’clock.
2.The Queen (to receive) some 3 million items of correspondence by 2002.
3.They (to count) that the Queen (to undertake) 251 official overseas visits to 128 different countries.
4.Before she (to enter) the public school she (to get) a good background at her preparatory school.
5.He (to be) sure of a successful future after he (to enter) that famous public school.
6.Kate (to watch) the London Marathon which she (to read) about in her textbook.