68. It’s very important to maintain your current weight through exercise and healthy eating.

4.You and your team can discover the answers to problems together.

32. Do you think you can do it by yourself?

19. My classmate is much cleverer than I.

67. You needn’t go there anymore. He already knows about it.

51. The students are encouraged to do more listening, reading and writing by their teacher.

29.The doctor had no choice but reach out to their colleagues across the nation.

57. In an age of plenty, we feel spiritually hungry.

34. People all over the world are trying to help the people in the quake-stricken areas.

64. Transistors are small in size and light in weight.