--Mum, I’m going to visit my uncle. What about staying there a week?--A week is too long. Try to be back in a _____ of days.

Look! Serveal __ are watching a group of ___ eating grass on the hill.

Teachers have to constantly update their knowledge in order to maintain their professional ______. 

I always persuade Mary to have both feet on the____as she wants to marry a millionaire and accomplish her goals in an easy way.

I have to reschedule the appointment with you since there is a ________ in my plan.