Many teachers were impressed by Kris's ________ attitude to life because he never gave up.

It was a real race________time to get the project done.Luckily，we made it.(2013·新课标全国Ⅰ，34)

I do ______ your timely help yesterday, without _______ I couldn’t have found the solution.

We already have ______ pencils, but we need two ______ pens.

 There is said to be no medicine for a cure _____ lung cancer.