1. ASAP – this means 'as soon as posible'.
2. By the book – to do something in this way is follow the rules and agree
with the law and company policy.
3. Get back in/into the swing of things - This means to get used to doing
something again after you have had a break from it.
4. uphill battle - something that is difficult to achieve because of obstacles
and difficulties.
5. in a nutshell – in a few words 

*Dispones de más Ejercicios de Inglés Comercial y de Negocios
con respuesta para practicar.