He spoke English so well that I took _______ for granted that he was an American.

It is not uncommon for there     problems of communication between the old and the young.

It wasn’t _____the anti-Japanese war was over _______ his parents had died two years before

 I’d prefer ______ in the office rather than ______ at home watching TV.

. My first summer vocation in the high school, _______I spent a fortnight on the farm, is really unforgettable.