1. Though we have had the boat repaired three times, it still l________.
答案：leaks
2. Do you know why a balloon can f________ in the air?
答案：float
3. The Titanic s________ into the bottom of the sea with over 1,500 passengers aboard.
答案：sank
4. A company with bad management can not s________ the market competition.
答案：survive
5. Fifteen days after e________ from prison, the prisoner was caught in a corn field at last.
答案：escaping
6. At the sight of her long lost son, the mother ________ (认出) him immediately.
答案：recognised
