Everyone may feel time____ very quickly when they do something interesting.

Thelittleboy________fortheapplesonthetree,butofcoursehewasnottallenough.[ ]

ldren often form some bad habits, ____________remain withthem as ling as they live.

What can we do to help animals in nature reserves— We can .

When Chinese people talk about American cities, the first_____ comes into their minds is San Francisco.