decide on the correct past modal verb and complete the gaps
Kelly: Hi everyone.So, let's get started on our essay. Mark, have you done the research from last week?
Mark: well, yes and no. I was trying to follow up on the suggestions from the lecture and I searched the library for books and journals.But I( (1)___ find anything relevant to our topic.
Louise: Well, maybe you were too late. We got the essay title two weeks ago other students (2)___ taken out all the books already.
Mark: Yes, I guess so
Kelly: It doesn't sound likely to me. All the books (3)___ been taken out there's lots of books about astronomy in the main library
Mark: Well, there was one book but (4) ___ borrow it because it's a reference only book
Kelly: Mn. We(5)___ started this project earlier. What are we going to do now?
Lousie: The other students (6)____ been very keen to start! Well, don't worry. Why don't we just reserve the books we want? I've found some articles we can start reading now and then we'll be more focused for when the other students return the books we need.
.
1. couldn't
2. must have
3. can't have
4. couldn't
5. should have
6. must have