27. Ecology is becoming one of the most important branches of biology, because only by understanding how plants and animals depend on each other and on their environment __________ in our changing world. (A) can we help surviving them (B) we can help them survive (C) can we help them survive (D) we can survive to help them

36. Time is a critical factor in college work: guard it carefully and use it economically. How can you develop the most successful time schedule for your purposes? In the first place, find out exactly what you have to do. Make a master list of responsibilities you must meet each week and special projects you must finish during the term. Then study yourself. Discover the hours you work best. The next step is to set up a plan to make the best use of your energies; schedule your best hours for the study of your most difficult subjects, your next best hours for the easier subjects, and your low-energy hours for rest, relaxation, or simple mechanical tasks. _________ (A) However, settle down and follow the plan until you form the habit. (B) Likewise, settle down and follow the plan until you form the habit. (C) Finally, settle down and follow the plan until you form the habit. (D) On the contrary, settle down and follow the plan until you form the habit.

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