Rewrite the following incomplete sentences carefully, so that the reader does not have to guess what is left out.
1. more and more books
2. too difficult
3. got up late, missed the bus
4. solved the mystery
1. I need more and more books to read.
2. This work is too difficult to be finished on time.
3. Since I got up late in the morning, I missed the bus.
4. My sister helped me and we solved the mystery.