At present, there is a great demand of flowers. (Interrogative)

Flower cultivation is very profitable now.

= How profitable flower cultivation is!

Many people cultivate flowers for earning money.

= Flowers are cultivated for earning money (by many people).

Everybody becomes glad to get flowers.

= There is nobody but becomes glad to get flowers.

In some cases, flowers are more welcoming than any other gift.

= In some cases, no other gift is so/as welcoming as flowers.