当别人问你问题你不知道时,你应说:________A.Sorry.I don't know. B.OK. C.Great.
I _______ London.
She _______ a Chinese pen pal.
_______ has a map. _______ map is new and big.
_______ has an apple. _______ have an apple, too.
-- Do you _______ a ball? -- Yes, I _______.