____ by taking part in practice can the young people be toughened and hardened into steel

The captain gave an order in the difficult situation________the sailors throw away everything that was on board the ship

(2012·衡阳高二检测) People often have the belief _______ a healthy environment and development cannot be possible at the same time, but this does not have to be true

I believe that he is a____ person, so he will succeed in time.[ ]

_______ the flower is! Do you know who bought it