1.As is known to all, China is the largest developing country in the world.

43. Who can help me clean the room?

63. He has taught English in this university ever since he moved to this city.

26. I've lost interest in my work.

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

33. The People's Republic of China (PRC), founded on October 1, 1949, covers an area of 9.6 million square kilometers.

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

9.Our textbooks are very different from theirs.

37. He was very happy to hear from his old friend.

16. I slept soundly all night.