Mr White, the principal, has made a great _________ to the growth of the school.
-Could you look after my pet dog for me while I am away? - _______.
-When will you go back to your hometown? - _______.
The flowers in the shop _______, so they _______ well.
-Can you show me _______ to use this kind of camera? -Sorry, I don't know, _______.
The purpose of new inventions is _______ life more difficult, but to make it easier.