The doctor assured the patient that there was ______ with her, but she could not help worrying.
He paid for a seat, when he _____ have entered free.
—Do you know where David is? I couldn’t find him anywhere.—Well. He _____have gone far—his coat’s still here.
If the new arrangement doesn’t _____, we’ll go back to the old one.
All the girls swam in the lake except two, who _____ halfway.
We’re so busy that no one in the office can _____ for any other work.