41.  Because it was colder that at home, and I had to do a lot of my homework.

42.  he students are not only required to digest the knowledge in the book, but also trained by doing a lot of additional and more complicated exercises to expand their skill.

43.  You must imagine what will happen if you change the conditions or states and do a lot of experiments to examine your imaginations .

44.  We now have to do a lot of preparation before the text begins.

45.  Moreover, machines can do a lot of things that human beings can not .

46.  In order to make a good master of certain thing, we must do a lot of practice.

47.  and I would do a lot that a common person can't do.

48.  During this important day, we do a lot of things.

49.  Criminals do a lot of harm to society.

50.  Moreover, as army is a group of good order and discipline, when veterans tranfer to other units, they will bring at the same time the good customs, which will do a lot of good to the units.