III Open the brackets using Past Simple or Past Perfect.
1. All my friends (to be) glad to hear that I (to pass) all the examinations successfully.
2. On my way to school I (to remember) that I (to leave) my report at home.
3. During the holidays my friend (to visit) the village where he (to live) in his childhood.
4. When they (to enter) the hall, the performance already (to begin).
5. When I came home, my mother (to tell) me that she (to receive) a letter from grandpa.
6. He (to open) his eyes, (to look) around and (to try) to remember what (to happen) to him.

Химические процессы наших тел связаны с чрезвычайно сложными последовательностями реакций,детали этих процессов далеки от полного понимания.Тем не менее большой прогресс был достигнут в нашем понимании процессов происходящих в организме.

Первая половина этого столетия может быть названа золотым веком физики,потому что было сделано так много открытий в понимании структуры молекул, атомов и ядер.По той же добродетели мы можем быть среди золотого века в биохимии.Следующие несколько лет исследований могут значительно повысить понимание химических процессов в клетках

1. We listened to the girls (singing) Russian folk songs./We listened to the Russian folk songs ( sung) by the girls.
2. The girl (washing) the floor is my sister./The floor (washed) by Helen looked very clean.
3. Who is that boy (doing) his homework at that table?/The exercises (done) by the pupils were easy.
4. The house (surrounded) by tall trees is very beautiful. / The wall (surrounding) the house was very high.
5. The girl (writing) on the blackboard is our best pupil. / Everything (written) here is quite right.
6. Read the (translated) sentences once more.
7. Name some places ( visited) by you last year.
8. I picked up the pencil (lying) on the floor.
9. She was reading the book (bought) the day before.
10. Yesterday we were at a conference (organized) by the pupils of the 10th form.
11. (Taking) the girl by the hand, she led her across the street.
12. It was not easy to find the (lost) stamp.
13. I shall show you a picture (painted) by Hogarth.
14. Here is the letter (received) by me yesterday.
15. Do you know the girl (playing) in the garden?
16. The book (written) by this scientist is very interesting.
17. Translate the worlds (written) on the blackboard.
18. We could not see the sun (covered) by dark clouds.
19. The (lost) book was found at last.
20. (Going) along the street, I met Mary and Ann.
21. Look at the beautiful flowers (gathered) by the children.
22. His hat (blown) off by the wind was lying in the middle of the street.
23. “How do you like the film?” he asked, (turning) towards me.
24. When we came nearer, we saw two boys (coming) towards us.
25. I think that the boy (standing) there is his brother.