The room is in a terrible mess; it （）（肯定沒打掃過）.

When I （）(發(fā)現(xiàn)他騙我) I stopped buying thins there and started dealing with another shop.

The price of beer（）(從50美分到4美元不等) per liter during the summer season.

（）(我們沒有人料到主席會(huì)出現(xiàn)) at the party. We thought he was still in hospital.

The sports meet originally due to be held last Friday（）(最終因天氣不好而取消了).

It may be necessary to stop（）(每隔一定時(shí)間) in the learning process and go back to the difficult points in the lessons.

She never dreams of （）(被派到國(guó)外).

The ship’s generator broke down and the pumps（）(不得不用手工操作) instead of mechanically.

But for his help, I （）(我不可能這么早完成).

Over a third of the population was estimated（）(無法獲得) to the health service.