请根据句意从方框中选择合适的词，并用其适当形式填空，使句子通顺。

1．We should remember that the second Sunday in May is ________ Day．

2．Would you please explain the long sentence as ________ as you can?

3．Which subject do you like ________, Chinese, maths or English?

4．－Jimmy and Joy, help ________ to some fish．

－Thank you．

5．There are two main topics in the world：peace and ________．