Choose the correct preposition

1. Some spiders can bite
   [through|out]
   clothing.
2. The doctor injected medicine
   [into|on]
   her arm.
3. Some jellyfish are difficult to see as they are nearly invisible
   [with|to]
   people.
4. Bob suffers
   [with|from]
   hay fever and has itchy, watery eyes.
5. Avoid the river
   [at|of]
   all costs. It is full of crocodiles!
6. His rash may last
   [for|with]
   a few weeks.
7. Please stay
   [away|out]
   from the water; there are sharks in the area.