Don't scold him; even an experienced engineer _____ make such a mistake after all.
To enjoy the scenery, Sara would spend long hours on the train ______ travel by air.
The audience ______ when they heard the humorous story.
He pretended to be English, but his foreign accent ________.
At this time tomorrow ________ over the Atlantic.
He had to be reminded two or three times ________ he could avoid making the same mistake.