Only when he returned ___________ that the war had ended and the army had come back. 

—________ no ad during TV plays.—Great move! I cannot tolerate those annoying ads appearing every several minutes.

I can well remember that there was a time _____ a deep blue sky,  the song of the birds,  moonlight and flowers could never have kept me spellbound. 

It was _______that they went for a walk in the park.

The British are not so familiar with different cultures and other ways of doing things, ___________ is often the case in other countries