We have only ______ pencils, we should go to buy some.
A:a few
B:few
C:little
When I see too much water ________ in our school every day, I feel very angry.
微风吊扇通电后扇叶转动,使微风吊扇转动的工作原理是____.拔下插头,在插头处接发光二极管,用手旋转叶片,发光二极管发光,这是____现象,人们利用这一原理制成了____.