Food safety is ________ important, so our government spares no efforts to prevent food being polluted.

There was such a long queue for the ticket that I ________ gave up, though I wanted to attend the concert so much.

When it comes to my hobbies, I like rock climbing______ . 

—You all like your English teacher?—Yeah, she devotes herself____ to teaching and it earns her a good reputation．

The second-hand car David bought the other day is as good as new; ______ it is in excellent condition.