听力原句：Student: I went off to the stack and found some really good material for my part, but when I got back to our table, they were just goofing off and talking. So I went and got materials for their sections as well.
2.go down the drain
听力原句：Student: I know, but I didn’t want to risk the project going down the drain.
3.start from scratch
听力原句：Student: But we’ve got all the sources and it’s due next week. We don’t have time to start from scratch.
4.come down to
听力原句：It’s been shaped by constraints over vast stretches of time, all of which comes down to the fact that the best foraging strategy for beavers isn’t the one that yields the most food or wood.
听力原句：I am afraid we don’t have any openings at lunch time. A lot of students want to work then, so it is really rare for us to have an open spot at that time of day.
听力原句：Pro: Oh, that's very thoughtful of you, Eric, but it will be low key, nothing flashy. That's not her style.
听力原句：There are variations on this model of course, but the common denominators are always an idea of creating a shopping space that will get people to shop in the city without needing their cars.
8.tongue in cheek
听力原句：But if you took away all the DNA that codes for genes, you still have maybe 70% of the DNA left over. That’s the so-called JUNK DNA. Though the word junk is used sort of tongue in cheek.
9.pull them from thin air
听力原句：To begin, how do we create fictional characters? We don’t just pull them from thin air, do we? I mean we don’t create them out of nothing.
听力原句：Advisor: Hi, Steven I schedule this appointment, cause it has been a while since we touched base.