Most scientists seem to agree that _______certain limit should be set on _______consumption of cars to ease air pollution．

Alice, could you help me _______ the map of the world We don’t need it.–With pleasure.

Little Sam is happy with the toy. It is ________ one he has ever got.

____ Helen’s knowledge and vocabulary expanded, sheasked more and more questions.

obile phone, to be most useful and fashionable, is popular with some teenagers.