In the experiment we kept a watchful eye ________ the development and recorded every detail.
Does this car give you good _____for your money ?
_____ we celebrate a festival it changes a little and in that way we keep our culture alive.
As everybody knows, Hong Kong used to be _____ part of _____ British Empire.
The manager decided to give the job to _____he believed had a strong sense of duty .
This is the last chance to go abroad for further education ; don’t _____.