Put the verbs in the correct form. 1. the students always (check up) their tasks in class. 2. the professor (check up) the papers after the exam. 3. he (check in) and went to buy a newspaper. 4. she (check in) when she comes to the airport. 5. you should (check out) before 11 a.m. 6. he just (check out) and is running after the bus. 7. find the books on the internet and (check off), then i'll buy them. 8. they (check off) the dishes and waited for the waiter to come.

1.check up
2.checks up
3. Checked in
4.checks in
5.check out
6.has just checked out
7.check off
8.checked off

1. Every day Julie takes the bus to go to her office.

2. At the moment you are doing an English exercise.

3. Tom and Julia are learning English this year.

4. The Bank opens at 9:30 every morning from Monday to Friday.

5. Our cousins are coming to see us next Sunday.

6. Tom reads the newspaper every morning on the train.

7. Julie usually cleans the house on Saturdays.

8. She is writting a letter to a client now.

9. Julie speaks three languages: English, French and Spanish.

10. Today is Sunday. Tom and Julie are working in their garden.

Дальше даны предложения на употребление Past Simple:

11. Yesterday evening I played tennis with a friend.

12. I started taking tennis lessons last year.

13. When I was at school I liked history.

14. Five minutes ago I finished my homework.

15. Last week I came back to Moscow.

Для иллюстрации масштабов работы по синтезу полимеров можно констатировать, что в настоящее время в течение одного года может быть синтезировано около 50 000 новых полимеров, т. е. более 160 новых полимеров в день или один новый полимер каждые три минуты. Полимер было заявлено, что технология будущего в значительной степени основана на химические отливая в форму процессы. Полимеры используются везде. Очень большой выдвижения были сделаны в работе на полимерах конструированных для различное электрического цели, как для как для продукция изоляторов, электрически проводя материалы, полупроводники и др.
(P.S.вроде бы правильно)