I have been to France once.

He finished all his work all at once.

This road is a dead end, so we have to find another way.

It was luck that he passed the exam.

Beautiful altocumulus clouds were spread across the sky.

Altostratus clouds are spreading in the sky, it looks like it's going to rain.

It's difficult to remember the units of weights and measures.

The picnic was cancelled because the weather was not good.

He went to a new school for changing school.

I went to see the beautiful scenery of Dohoku.