Advanced grammar (2) - B2

Tommy, (1)        [you'd, you'll, you're, you've] better slow down and wait for the rest of us. I'm sure we have lots of time, so we (2)              [aren't need, don't need, needn't, needn't have] to run. We don't (3)              [have to, have got to, must, must have to] stop and buy tickets and there are stil lots of people on the platform, so the train (4)            [can't, can't be, can't have, couldn't] come yet.

Joe has just returned to the school computer room where Sam is working.

Joe: Who (1)           [has, has he, have, have they] been using my computer?

Sam: I have (2)           [no, no longer, not, not an]idea. But these computers are for any student who wants to use them, (3)             [aren't they, can't it, don't they, isn't it]?

Joe: Of course. But (4)         [aren't, didn't, don't, haven't] you see me doing my work on that one before lunch? I hope I remembered to save it.

Liz is helping Lucy clean out her flat.

Liz: Did you want to keep all these old books or (1)         [no, none, not, nothing]?

Lucy: I'm not sure. They look interesting, but (2)         [none, no one, not any, nothing] of them would be worth anything.

Liz: So, (3)           [for what, for which, what, which] of them do you think (4)         [are, are you, you, you are]going to keep?