Question

Rewrite the following sentence correctly: The box of chocolates are very expensive.

Answer 1

The correct sentence should be:

The box of chocolates is very expensive.

Reason: While dealing with sentences that contain two nouns which have numbers (here box-1, chocolates-many) we consider the number of verb according to the number of the first noun. In this case it is box, which is singular. So there should be "is" instead of "are".

Answer 2

the box of chocolates is expensive 
reason; the box of chocolates is a collective noun.collective nouns must be considered as singular .so the singular verb is is used instead of are.

hope it helps...