Вставить 'a lot of' и объяснение.

1. I like reading. I have a lot of books. 2. We enjoyed our visit to the museum. We saw a lot of interesting things. 3. This road is very dangerous. There are a lot of accidents. 4. We enjoyed our holiday. We had a lot of fun. 5. It took me a long time to drive here. There was a lot of traffic.