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—Hurry up, Michael! It’s ten to three.

—Goodness me! The class_______. I’ll be late again.

A. must begin      B. may begin      C. should have begun       D. must have begun

—It is the first time that I ________ here in Hong Kong.

—What great changes！It’s ten years since I ________here last time.

A．have been；came???????????????????? B．have been；have come

C．am；came?????????????????????? ???? D．was；have been

 It’s ten years since the scientist ____ on his life’s work of discovering the valuable chemical.

A．made for          B．set out            C．blocked out        D．turned up

—It is the first time that I ________ here in Hong Kong.

—What great changes！It’s ten years since I ________here last time.

A．have been；came   B．have been；have come  C．am；came  D．was；have been