The twins are ________ . They come from ________ .

[　　]

A．Americans, American

B．American, American

C．American, Americas

D．Americans, America

Mary and Sam are ________. They come from________.

[　　]

A．Americas; America

B．America; American

C. Americans: America

D．American: America

______ saying hello to them and asking them where they come from?

　　A．Why not

　　B．Why don't you

　　C．How about

　　D．Remember to

A．Americans, American

B．American, American

C．American, Americas

D．Americans, America

选择填空:

____ tell what UFOs are and where they come from. 

[　　]

A. Not anybody can　　  B. Anybody can't

C. Nobody can　　　　   D. Not one can