You’d better sing. It doesn’t _____ whether you can sing well or not.[ ]

The boy whose name is Justin is nowhere to be found, ______?

Can you give me a hand?—Sorry, I can’t help you do this because it is ________my ability.

Miss Li donated some old clothes and money to charity.

On the night of February 14th, 2011, all the Chinese _________ by Guo Mingyi, a very common worker who ________ more than 180 poor children since 1994.