（） difficulties they may come across, they"ll help one another to overcome them.

单项选择题The doctor said that mental （） is the major cause of his sleeping problem.

单项选择题（） comes back first is supposed to win the prize.

单项选择题The last time I saw her was （） my brother s wedding ceremony three years ago.

单项选择题Education cannot be （） in any country.

单项选择题I have two children but （） of them likes fruits.