The first mosque in India to successfully use the full dome was _________.
Fill in the blanks:
(a) The first structure to successfully use the dome was called the __________.
(b) The two architects who designed New Delhi and Shahjahanabad were __________ and _____________.
(c) The British saw overcrowded spaces as ______________.
(d) In 1888 an extension scheme called the ___________ was devised.