_____ reading may take up too much of your time, it is very helpful in raising your grades efficiently.
—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.