Alison is down with the flu. There is no way she is at work now! (be) Alison .............................as she is down with the flu
can't be working
Perhaps she is travelling but I really don't know. (be) She..................................... but I am not really sure.
might be travelling
She has just retured from her graduation trip in Bariloche. I presume she is exausted. (be) She..........................from her graduation trip in Bariloche.
must be exhausted