| warm up(verb, expression, phrasal verb, study, work) |
| work(noun, verb, break, study, develop) |
| work out(verb, expression, study, work, develop) |
| R and D(noun, expression, idiom, study, measure) |
| accustom(verb, study, develop, improve, prepare) |
| act(noun, verb, study, prepare, practice) |
| action |
| air cover |
| air raid |
| air support |
| alertness(noun, organization, study, increase, plan) |
| amphibious operations |
| analysis(noun, study, check, measure, struggle) |
| anticipation(noun, organization, study, increase, plan) |
| arrangement(noun, organization, study, increase, plan) |
| assay(noun, study, check, measure, struggle) |
| assessment(noun, check, approval, examination, test) |
| assignment(noun, study, practice, discipline, exercise) |
| attempt(noun, verb, study, go, work) |
| background(noun, organization, study, increase, plan) |