Why not ________ for help when you were in trouble

Why didn’t Tom give you one of his paintings? — I didn’t want one, but he would have given me one if I______.

The spacecraft has never been to the moon, ________ —Certainly.

This summer is very hot –Yes, but it’s not __________ as hot as last summer

I guess we’ve already talked about this before but I’ll ask you again just __________.[ ]