To tell _____ truth, it is ______ struggle for Jack to get ready in such a short time.
I’ve finished writing the novel, ____ is to be published next month.
He returned home safe and sound after a fierce battle, ____ was unexpected.
____ we is known to all, English is not very difficult to learn.
The old man had three sons, all of ____ died during World War Ⅱ.
I have bought two pens, ____ write well.