It’s kind __________ Yao Beina to donate her corneas (眼角膜) _________ three people in need.

Why is he feeling down today?—Because the suggestion he________has been turned down.

It’s not a good idea to _______these old buildings in the city.

－Recently Amy _______ a prize for volunteer to help others.－So she did. She is a good example for us.

Only by_______each other can we achieve ourgoals .