1. What is syphilis? 2. When do symptoms appear after exposure?
3. How many stages is the disease divided in?
4. What are the main symptoms of the first stage?
5. Are chancres painful? Are they infectious?
6. What is the last stage characterized by?
7. What problems may a pregnant woman with syphilis have?
8. How do people may prevent the risk to be infected by syphilis?

Более-менее вынужденные артикли для Вас поставил. Если задание заключалось в САМОСТОЯТЕЛЬНОМ нахождении мест для артиклей в предложениях, то ответ, по-моему, должен быть таким:

1.) I don't like reading romantic novels. The romantic novels in read were rather silly.

2.) I hate wearing formal clothes. The formal clothes I wear are always black.

3.) I dislike eating spicy food. But the spicy food I had in India was just to my liking.

4.) They say that European cities are polluted by cars. The cities we visited in Germany weren't polluted, air was fresh and clean.

5.) people usually think that babies are sweet. The babies I took care of were constantly crying.

6.) Sorry I'm late. I took a wrong bus.

7.) A/(-) captain of a ship welcomed passengers on a deck.

8.) We don't know how old the Universe is.

9.) Duke Street? We live in the same street.

10.) The lion is King of jungle through it lives on plain.

11.) An/(-) invention of the wheel was a great step in the development of the transport.

12.) You shouldn't ask questions, if you already know answers.

13.) Paris is the capital of France.

1. The postbox is emptied every day.
2. The stamps are postmarked at the post office.
3. The letters are sorted into the different towns.
4. The mail is loaded into the train.
5. The mailbag is unloaded after their journey.
6. The bags are taken to the post office.
7. The postbox was emptied yesterday.
8. My question was answered yesterday.
9. Hockey is played in winter.
10. Many houses were burnt during the Great Fire of London.
11. Flowers are seld in shops and in the streets.
12. St.Petersburg was found in 1703.
13. Many houses are built in our town every year.
14. This text was translated at the last lesson.
15. We were invited to a concert last Saturday.
16. I was given a very interesting book at the library last Friday.
17. These trees were  planted last autumn.
18. This bone will be given to my dog tomorrow.
19. Mushrooms are gathered in autumn.
20. This work will be done tomorrow.