A ship in harbor is safe, but that’s not ______ ships are built for.
—What do you think of John?—He’s a good boy, but he ______ be really stubborn at times.
In order to support his study, his brother can’t wait ______ money.
It’s always difficult to live in a foreign country, ______ when you don’t speak the language.
He still remembers the place ______ we visited last year?
We won’t give up ______ we should fail 10 times.