An apple ...... day keeps the doctor away.

Dr Brown goes to the US about once ...... month.

The children go to the playground about twice ...... week.

My husband George goes shopping about three times ...... fortnight.

The little ones are allowed to watch TV around once ...... month.

Jason is a little sick so he has to go to the toilet about once ...... night.

The annual meeting takes place once ...... year; after all it's called annual.

A: How often do you go swimming?
B: Once in ...... blue moon.

The following products are sold at one dollar ...... kilo.

The new scissors are being sold at two euros ...... pair.

You can now buy eggs for about thirty cents ...... dozen.

The new shop round the corner sells Coke at £ 2.30 ...... package. That's six four bottles in total.

I'll sell you the tomatoes for £ 4.50 ...... bag.

My new Lamborghini can drive 200 miles ...... hour.

Have you ever heard about the once ...... quarter fundraiser?