—You can ________ to the charity.
A:take after
B:work out
C:put off
D:give away
-- Mike, I brought a new clock for you on my way home. Here you are.
-- Oh, thank you, Mum. Let me ________.
三个体积相同质量相同的空心铜球、铁球和铝球,空心部分体积最大的是( )