6.Tenants are obligated () pay their rent on time.

10.His () is to sail around the world before 50.

31. What does the story suggest in the beginning?

21:When I asked my students to practice holding a conversation in class, they looked confused. What's worse, my students 21.() hard in this class activity. I came to realize thatcultivating in students the ability of communicating with each other in real time has been 22. () in the current education. Face-to-face communication is probably the most important skill in the 21st century. It is a(n) 23. () a skill indispensable for job interviews, pay raise negotiations, project discussions, and making life decisions. However, students' 24. () on smartphones for communication is making it difficult for them to engage in face-to-face talk. The strong push for screen use in schools has also led to 25. () consequences. It prevents students from developing the ability of 26. () thinking. It also dumbs down their communications, even on the most important matters. Now that technology has an important 27. () on students' lives, probably we could take advantage of digital devices to help students regain the lost art of face-to-face conversation. I have noticed that students take conversations, debates, and discussions more 28. () when recorded. We can encourage students to 29. () a balance between digital literacy and interpersonal conversation. In this way, students will be able to learn to maintain 30. () conversation.

15.In this chapter, you will learn how to think () your feet and give short speeches without preparation.

37.人运河(Grand Canal)始建于公元前4世纪,公元13世纪末建成。修建之初是为了运输粮食,后来也用于运输其他商品。长久以来,大运河有力地促进了南北地区之间的人员往来(personnelexchanges)和文化交流(cultural interaction)。

18.The meeting allows students to () their frustrations.

20.The job market looks a lot better here, so if things do () there are more opportunities.

7.They won't only be using () and antique pottery this time, however.

8.This was a socially () moment when I had to ask her "Are you an adult or a senior?"