1. 
In this context, "bring about" means to cause or produce something. Therefore, the best synonym is A. provide.
2. 
Here, "looking for" means searching for. So, the correct synonym is B. in search of.
3. 
"Appropriate conditions" refer to suitable or favorable circumstances. Hence, the answer is D. favorable.
4. 
"Devastate" means to cause great and widespread destruction or ruin. So, the correct synonym is C. destroy.
5. 
"Because of" indicates the reason for something. Therefore, the answer is D. on account of.