34. When was the first man-make satellite launched by the Russia?

35. When did Neil Armstrong set first foot on the moon?

36. What was invited by Lewis Waterman in 1884?

37. When did people know how to make paper from wood puld?

38. Who Arabs learned about papermaking from?

39. Why were they late for school?

40. When did you stay with your friends?

34. The first man-made satellite was launched by the Russia in 1957.

→ When was the first man-make satellite launched by the Russia?

35. Neil Armstrong sets first foot on the moon in 1969

→ When did Neil Armstrong set first foot on the moon?

36. The fountain pen was invented by Lewis Waterman in 1884.

→ What was invited by Lewis Waterman in 1884?

37. People knew how to make paper from wood pulp (bột gỗ) long time ago.

→ When did people know how to make paper from wood puld?

38. Arabs learned about papermaking from Chincse prisoners. (tù nhân)

→ Who Arabs learned about papermaking from?

39. They were late for school because of the traffic jam.

→ Why were they late for school?

40. We stayed with our friends two weeks ago.

→ When did you stay with your friends?