The old man lives _____ in a ______ house, but he doesn't feel_____.

    Everybody, welcome to ____(we) company. I am Luisa, Director of the department. Let me say something to you all. The starting of work can be exciting on the hand, and can also be ____(worry) on the other. No matter what your future job is, you will have to work with others. Leaning to get on well with others must come first,____ (include) all staff in the company and our ____ (custom).

    And secondly, right after my introduction, spend some time reading the introduction of our company and get to know the people in your office and find out ____ the company is like. This afternoon you can walk around our workshops and know ____ (much) about the products. No one is allowed ____ (leave) the company before 5:30 pm. By the way, lunchtime ____ (come) at 11:50 and it's free ____ charge.

    Remember: Learning is so important ____ it can change your future life.

This is what I'd like to say to you at the moment. If you still have any question, please come to my office. Thank you.

“人类社会每一次重大跃进，人类文明每一次发展，都离不开哲学社会科学的知识变革和思想先导。”这段话表明哲学社会科学（  ）

①能够预见和指明社会的前进方向

②是推动历史发展和社会进步的重要力量

③能够为人类社会发展提供具体方法

④是推动人类文明发展进步的动力与源泉

如图，Rt△ABC中，∠BAC=90°，AD⊥BC于D，设∠ABC=α，则下列结论错误的是（　　）