Five firemen ________ escaped death when a staircase collapsed beneath their feet. 

 Simon has lived in Spain for more than 10 years, but _______ enough, he can’t speak a word of Spanish.

Lily seems to know a lot about Hong Kong, but      she has never been there.

＿＿＿＿to my regret, I am unable to accept your warm invitation. 

“If you’re walking down the right path and you’re willing to keep walking,_____ you’ll make progress”, said the president Obama.