This design is ________ satisfactory.So you’ll have to try your best to better it.

Sometimes _______turns off the lights in the classroom because every body thinks somebody will do it.

Believe it or not, no bread eaten by us is so sweet as ___________ earned by our own labour. 

The advertisements say 2046 is the most romantic film. But I’m sure it won’t interest　　　　.

Many of the exhibits were damaged in the fire and _______ were totally destroyed.