Choose the correct item.
1 Dr Boston volunteered to carry out/up the research
2 Poor concentration is often associated with/to lack of sleep.
3 Max can draw a map of the city's metro system in/from memory.
4 Our bodies are affected by our lifestyle, and the same is true of/with our brains.
5 You aren't allowed to use calculators; you must solve all the maths problems in/by your heads.​