Here’s a possible completion for the blanks based on typical library assistant duties:

1. **school**
2. **library**
3. **shelves**
4. **organized**
5. **lunch**
6. **volunteer**

So the filled text would read:

"Last summer I volunteered to work as a library assistant for my (1) school library. Every day I would arrive at the library at 8.30. I opened all the windows, turned on the lights and the air (2) library got everything ready before the library opened. At 9 o’clock, the first visitors arrived. I helped them find the books or (3) shelves they needed, checked out or checked in the materials they borrowed or returned, and answered phone calls. I also helped keep the books and materials in (4) organized by putting them back on their shelves. I finished work at 12.30. After having (5) lunch, I didn’t usually go home. I stayed at the library to do my homework or read books. I loved my (6) volunteer work."