fill in with prepositions

1. Due to some agitation they were held__ on the highway.
2. After school hours the sports team was kept__.
3. She let her friend __ a secret.

Dear student 

The answers are - 

1. Due to some agitation they were held up on the highway.
2. After school hours the sports team was kept in.
3. She let her friend in on a secret. (to let someone in on a secret is a commonly used phrase, which means to reveal a secret. Therefore there should be 2 prepositions used here.) 


Regards