By the time California to become the 31th federal state of the USA in 1850, it was already a multicultural society.
| A．selected | B．collected | C．existed | D．elected |
We are having a class get-together. It’s been twenty years we graduated from high school.
| A．before | B．since | C．after | D．when |
—I have finished the homework.
— . How about going out for a walk?
| A．So have I | B．So I have | C．So I do | D．So do I |
—You seemed not to be interested in the story yesterday.
—Yes. I it in a magazine before.
| A．read | B．was reading | C．have read | D．had read |
We should go to school by bus or underground rather than by car global warming.
| A．reducing | B．to reduce | C．reduced | D．having reduced |
—Now, where is my key?
—! They are waiting for us at the school gate.
| A．Take it easy | B．Come on |
| C．Take your time | D．Don’t worry |