Such a problem is＿＿＿＿difficult for a primary school student ＿＿＿

She_______ballet before she entered film industry.

than carry out the project by itself, the company planned to _________ with other potential cooperators.

iverse society, one would expect ________ multiple interpretations of rights.

So difficult __________ it to work out the problem that I decided to ask Tom for advice.