We arrived at work in the morning and found that somebody ________ into the office during the night.(2011·江西)

Often he______ sit for hours doing nothing at all whenhe was in low spirits

What do you think of sleeping outdoor atnight —________. I like it.

下列各句中，没有语病的一句是（ ）

9,500 drivers ____ since the beginning of theyear, 23% were found ____ in road knowledge