You were _______ to take your shoes off when you entered the school lab, but you didn’t.
—What does the sign over there read? —No person smoke or carry a lighted cigarette, cigar or pipe in this area.
Walking alone in the dark, the boy whistled to his courage.
It was in the remote mountain areas I spent the gap year I learned how to work with a group of strangers and how to look after myself.
--- What are you busy with? ---The exhibition ____ in the city next week.
---Jack can't concentrate on his study recently. --- Yes, that might ____ why he did so badly in the last test.