1. We went to the nursery school to help_to_look after____ babies. 2. All the teachers_have__set out___ to look for the missing students. 3. The English teacher wrote out__ a list of books for us to read on the first day of school. 4. What are the boys__talking about____? They look excited. 使用下列词语：set out, look after, by underground, talk about, write out
