Study the following sentences. Select the one underlined word which is incorrect. Write the incorrect answer in the boxes provided. One has been done as an example.
e.g. The National Gallery of Art at Washington D.C., is one of the world’s greatest museums.
(a) Millions of people had entered its doors to see the paintings by some of the world’s finest artists
(b) But if, those priceless masterpieces are to be preserved, the gallery must protected them carefully.
(c) The 150 guards have successively prevented damage and theft.
(d) But, protecting the paintings from nature was a greater problem.