As is often pointed out, knowledge is a two-edged weapon which can be used _____ for good or evil.
Our TV sets sell well, but ten years ago no one could have imagined such a big share in the market that they ____.
This photo of mine was taken ______ stood the famous Eastern Bright Pearl in Shanghai.
To our surprise, the painting considered______ should have won the prize.
It was ______ the old clock that the old man spent the whole morning at home.
The joke told by Tom made us______, so our maths teacher couldn’t make himself______.