It was several minutes before I was of what was happening.[ ]

Are you allowed ______ the hall at this time—Sorry, I’m afraid not.

Have you read _____book called “HarryPotter” –Yeah, and I want to read it _______second time.

Some 　　　　of the flu, such as headache and aching muscles are often caused by poisonous products.

Last night Li Ping watched the football match at my home, so he________ in his office.