--The pet dog in your hand is very nice. Is it ?--Yes, but I’ll give it to my friend, Lucy, as birthday present.
It’s necessary for usEnglish well.
Mrs Brown looks young., he is over 70 years old.
—When did the planeBeijing? —Sorry, I don't know.
Which is, the sun, the moon or the earth(地球)?
—Where is Peter? —I’m not sure,he’s at home.