A．to learnB．learnC．in learningD．learnedMany teenagers f……

单项选择题Some areas, （） their severe weather conditions, are sparsely populated.

单项选择题He might have been killed （） the arrival of the police.

单项选择题Although it s tough finding a job these days, Henry got a （） in a famous company.

单项选择题（） 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.