Everything ________into consideration，they ought to have another chance[ ]

This passage puzzled me so much that I stopped for a few seconds to _____.[ ]

Where did you ______ our chemistry teacher?—– It was in the supermarket ______ I saw him.

____________better ways for digging tunnels__________,the first railway tunnel under the River Thames was dugin 1884.

what do you think of living in the country—____________