45. We managed to dig the Panama Canal.
→ We succeeded in digging the Panama Canal.

46. It took Mary 3 hours to travel to Ha Long Bay last Sunday.
→ Mary spent 3 hours traveling to Ha Long Bay last Sunday.

47. I fell asleep because the film was boring.
→ It was such a boring film that I fell asleep.

48. I had better go back to work.
→ It’s time I went back to work.

49. The black dress is more expensive than the red one.
→ The red dress is cheaper than the black one.

50. The film about my village is more interesting than the book.
→ The book about my village is not as interesting as the film.