Now researchers say that middle age________be the most fruitful time of life, full of new growth and development.
___, they set out to break the record for crossing channel swim.
So far nobody has claimed the money ___ in the library.
The workers ___ the glass and marked on each box“This Side Up”.
More and more high-rise buildings have been built in big cities ___ space.
Some insects ___ the colour of their surroundings to protect themselves.