________ the calculation is right, scientists can never be sure that they have included all variables and modeled them accurately.
He insisted that we all _____ in his office at one o’clock.
I wish that you _____ such a bad headache because I’m sure that you would have enjoyed the concert.
I do not have a job. I would find one but I _____ no time.
I left very early last night, but I wish I _____ so early.
The librarian insists that John _____ no more books from the library before he returns all the books he has borrowed.