Transformation of sentence

The sum is so difficult that it cannot be solved.

What did the shopkeepers want to do for the princess?

Change the following sentences as directed :

Mango is one of the sweetest fruits. (Positive)

Fill in the blanks

The Paper is ------the table.

Fill in the blanks with right form of the verbs

He took these measures with a view to........ (help) people.

Write correct form of verbs:

She (come) of a respectable family.