You will succeed in the end ____ you giveup halfway

Mum, do you know if Dad _____ a model plane for me- I think he will do if he _____ free.

We meant to finish the work by dark, but we were so tired that we could not ______.

There’s no way of getting __________it—-you’re going to have to tell the truth

I don’t think he is ______ to come to our help when we get into trouble.