On the way_____________ the mountain village, we found the local house different from ours．

Hundreds of species are declared to _____in the coming century.

John’s never flown to Canada,

My grandma started using Weibo at the age of 70. She always says it’s never ____ old to start doing things.

Not until ________ in the college entrance exam ________ that he had wasted much time using his mobile phone to surf the Internet and play games.