No sooner _________ to school _________ the bell for the first class began this morning.

He failed the midterm examination and only then ________how much time he had wasted.

John opened the door. There _____ he had never seen before. 

Every evening after dinner, if not            from work, I will spend some time walking my dog.   

The experiment shows that proper amounts of exercise ,if _______regularly, can improve our health.

Not until I ________ to work ____ how much time I had wasted.

Up went the price and _______.

So sudden ______ that the enemy had no time to escape.

Only when the European countries' financial system broke down _____to take measures to deal with those problems．

_____all over the hills and around the lake are wild flowers of different kinds.