I called you at 8:00 yesterday evening, but no one answered. —Sorry. I________ clothes for my parents at that time.

His idea is always so advanced that we allthink that he is____ our time.

It was at the school gate _______ I met an old friend of mine after class.

I have an ______book. Let’s read(阅读) it now.

Tom hid himself behind the door, _________ he could hear the steps of his mother clearly.