--Have you improved your spoken English ?--Yes, I have. I've ____ improved a lot.A. yet; yet B. yet; already C. already ; yet
You can see an________in the zoo.
—I think recycling books and paper is useful. —________
—Where is David? —I think he________Australia.
—Have you packed the camera yet? —Yes,of course.I________it last night.
Homo erectus pekinensis(北京人)________in Zhoukoudian Village,on the Longgu Mountain,Fangshan District,Beijing.