At, it,on

Columbus made his first voyage from Europe to America ...1492

If the sky is clear, you can see the stars...night.

In Britain people send each other cards...Christmas.

I've been invited to a wedding ...14 February.

There are usually a lot of parties ...New Year's Eve

I hope the weather will be nice...the weekend.

I don't like travelling... night.

The course begins ...7 January and ends sometime ...April.

We always visit our grandparents...Sundays.

Many of Europe's great cathedral were built...the Middle Ages.