Dr Frank failed many times but hefinally _______ to find a successful way to solve the problem

I get ______information for my lessons on the Internet .

I was very lucky to _________ this different way of life in the UK，and I really hope to go back and study in Manchester again.

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

The mother often tells her son to be a good boy, warning him to______ trouble.