In, at on

See you _____Friday.

I brush my teeth _____the morning.

The match is _____4 o'clock.

We have lunch _____midday.

I'm busy ______ the moment.

My parents always visit me ______my birthday.

He was born ____ the 19th century

He usually goes on holiday ______July

They always get together ___ Christmas.

You can come ______ the weekend.