He devoted himself _______ to his research and got many achievements.

—I wonder ______you’ll water this kind of flower .—Every other day .

_____ to the delight of the schoolchildren, they will have a longer winter holiday which falls a week earlier than they have expected.

The local government has been accused of not responding _________ to the needs of the homeless in the flood-stricken area．

If we work with a strong will, we can overcome any difficulty, ＿＿＿great it is.