Choose the correct options

1. Let's go
   [around|over] the answers to these questions.
2. Jeff is looking
   [for|up] a T-shirt in his rucksack.
3. My alarm clock is set to go
   [off|over] at 7 a.m.
4. You should look
   [up|after] the definition in your dictionary.
5. A bomb went
   [off|over] and destroyed the building.
6. Don't worry, there is enough cake to go
   [around|off].
7. The researcher looked
   [after|through] his files for the document.