( )16. -Look at the boy running on the playground. Is it Davis?
-"It _______ be him, I saw him go to the teachers' office just now.
A mustn't B can't C couldn't D must
( ) 17.My uncle _______ a farmer. Now he is a driver,
A is used to B is used to be C used to being D used to be
( ) 18. There is little coffee in the bottle, _______?
A is there B isn't there C is it D isn't it
( ) 19. I find this computer game to play.
A. enough easy B. easy enough C. enough easily D easily enough
( ) 20. _______ hey were moving at when I went in!