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.
My favorite free time activity is going to the beach. There is nothing better than liying on the beach, at the hot sun, listening to the wawes...Of course this activity I can only perform in the Summer.Unfortunately. This is my favorite but not the only activity that I enjoy doing. I like to take a walk in the fresh air, in the mountains or just in a simple forest, with my friends or alone.That can be also a sport for me, sometimes I run, sometimes I just simply walk. I enjoy also doing mountain climbing but it´s very rare for me doing it. When I go to the beach, I also run there and I like to swim from one island to another( if they are close, of course).And the last activity that I enjoy, is football, I know that I´m a girl but, I can´t refuse playing a little soccer.