Dublin is situated at the mouth of river ______?

The national flower of Britain is ______?

The country which has the greatest population density is ______?

The world's largest diamond producing country is ______?

The world's largest producer of manganese is ______?

A man rode into town on Friday, stayed for three days and three nights and then rode out, again on Friday. How could this be possible?

I am so fragile that when you say my name you break me. What am I?

What can run but never walks, has a mouth but never talks, has a head but never weeps, and has a bed but never sleeps?

Maary's father has four daughters. The first is called Ann, the second is called Anna and the third is called Annie. What is the name of the other daughter?  

What letter is next in this sequence? M, A, M, J, J, A, S, O,__