Exercise : Put a / an or the in each space, or leave the space blank. 
1. Neil Armstrong made _ first footprint on _ Moon. 
2. There was _ accident yesterday at _ corner of _ street. 
3. I need _ time to think about _ offer you made me. 
4. _ recipe for _ success is _ hard work. 
5. _ people who live in _ glass houses shouldn't throw _ stones. 
6. _ worst part of _ living in a caravan is _ lack of space. 
7. _ book you ordered _ last week is now in _ stock. 
8. _ dancing is _ more interesting activity in than _ reading. 
9. _ people who meet on _ holiday in _ north of English sent us _ postcard. 
10. _ little knowledge is _ dangerous thing.