It suddenly occurred to him________he had left his keys in the office. (2012·江西,25)
She is a wellknown doctor now, but she ________ as a cleaner at the hospital for five years.
Some StraightA students in school ________ to be less successful in society than they ________ expected.
—When did Bob leave? —I have no idea. I ________ a shower upstairs.
She is a hardworking student, and all her spare time she has ________ staying in the library.
—Do you know the Water Cube at all? —No, this is the first time I ________ here.