23. I'm thinking about a visit to Paris.

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

47. Fred was such a hardworking student that he soon came out first in the class.

31.I knocked on his door but nobody came to answer it.

58. In no other country in the world can you find such plants as this one.

8.He prefers coffee to tea.

54. Various substances differ widely in their magnetic(磁性的)characteristics.

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

9.Our textbooks are very different from theirs.

66. If you decided to learn a new language, you would have to devote all your efforts to it.